| **Long-Term Debt Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands**                             | 3 Months Ended |             |           |           |           |
|-------------------------------------------------------------------------------------------------------------------------------|----------------|-------------|-----------|-----------|-----------|
||
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt    | $ 555,500      |        |      |      |      |
| Document Period End Date                                                                                                      | Mar. 31,  2020 |        |      |      |      |
| Line of Credit Facility, Initial Borrowing Base                                                                               | $ 2,100,000    | $ 1,700,000 |      |      |      |
| Revolving Credit Facility Elected Commitment Amount                                                                           | 1,700,000      |        |      |      |      |
| Debt Issuance Costs, Line of Credit Arrangements, Net                                                                         | $ 11,000       |        | $ 8,900   |      |      |
| Line of Credit Facility, Weighted Average Interest Rate                                                                       | 2.70%          |        |      |      |      |
| 6.25% Senior Notes due 2025 [Member]                                                                                          |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Debt Instrument, Interest Rate, Stated Percentage                                                                             | 6.25%          |        |      |      |      |
| Senior Notes ($)                                                                                                              | $ 102,300      |        |      |      |      |
| 5.75% Senior Notes due 2026 [Member]                                                                                          |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Debt Instrument, Interest Rate, Stated Percentage                                                                             | 5.75%          |        |      |      |      |
| Debt Instrument, Frequency of Periodic Payment                                                                                | semi-annually  |        |      |      |      |
| Senior Notes ($)                                                                                                              | $ 600,000      |        |      |      |      |
| 1.125% Convertible Senior Notes due 2021 [Member]                                                                             |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Debt Instrument, Interest Rate, Stated Percentage                                                                             | 1.125%         |        |      |      |      |
| Debt Instrument, Frequency of Periodic Payment                                                                                | semi-annually  |        |      |      |      |
| 6.125% Senior Notes due 2024 [Member]                                                                                         |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Debt Instrument, Interest Rate, Stated Percentage                                                                             | 6.125%         |        |      |      |      |
| 6.25% Senior Notes due 2025 [Member]                                                                                          |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt    | $ 555,500      |        |      |      |      |
| Debt Conversion, Original Debt, Interest Rate of Debt                                                                         | 101.00%        |        |      |      |      |
| Debt Instrument, Repurchased Face Amount                                                                                      | $ 447,700      |        |      |      |      |
| Redemption offer accepted                                                                                                     | 452,200        |        |      |      |      |
| Debt Instrument, Repurchase Amount                                                                                            | 6,200          |        |      |      |      |
| Unamortized Debt Issuance Expense                                                                                             | (990)          |        | 0         |      |      |
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | 550,000        |        |      |      |      |
| Senior Notes ($)                                                                                                              | 102,324        |        | 0         |      |      |
| 5.75% Senior Notes due 2026 [Member]                                                                                          |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Unamortized Debt Issuance Expense                                                                                             | (5,511)        |        | (5,734)   | $ (7,600) |      |
| Senior Notes ($)                                                                                                              |           |        | 600,000   |      |      |
| Maximum Borrowing Base [Member] | Revolving Credit Facility                                                                   |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Line of Credit Facility, Maximum Borrowing Capacity                                                                           | 2,500,000      |        |      |      |      |
| Revolving Credit Facility                                                                                                     |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Long-term Line of Credit                                                                                                      | 617,000        |        | 4,000     |      |      |
| 1.125% Convertible Senior Notes due 2021 [Member]                                                                             |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Convertible senior notes fair value                                                                                           | $ 200,000      |        | 200,000   |      |      |
| Convertible Note, Conversion Price                                                                                            | $ 85.39        |        |      |      |      |
| Liability component of gross proceeds of Convertible Notes                                                                    | $ 160,500      |        |      |      |      |
| Debt Instrument, Convertible, Carrying Amount of Equity Component                                                             | 39,500         |        |      |      |      |
| Unamortized Debt Issuance Expense                                                                                             | (1,422)        |        | (1,666)   |      | $ (4,800) |
| 6.125% Senior Notes due 2024 [Member]                                                                                         |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Unamortized Debt Issuance Expense                                                                                             | (4,366)        |        | (4,611)   |      | $ (7,800) |
| Senior Notes ($)                                                                                                              | $ 400,000      |        | $ 400,000 |      |      |
| Alternate Base Rate Option [Member]                                                                                           |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Line of Credit Facility, Interest Rate at Period End                                                                          | 0.50%          |        |      |      |      |
| LIBOR Option [Member]                                                                                                         |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Line of Credit Facility, Interest Rate at Period End                                                                          | 1.50%          |        |      |      |      |
| Unused Commitment Fee [Member]                                                                                                |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Line of Credit Facility, Interest Rate at Period End                                                                          | 0.375%         |        |      |      |      |
| Subsequent Event [Member]                                                                                                     |           |        |      |      |      |
| **Debt Instrument**                                                                                                           |           |        |      |      |      |
| Revolving Credit Facility Elected Commitment Amount                                                                           |           | $ 1,700,000 |      |      |      |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.
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Liability component of the gross proceeds of Convertible Notes prior to their maturity date.
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Line of Credit Facility, Initial Borrowing Base
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Redemption offer accepted
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Senior Notes Assumed with Acquisition
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Senior Notes Redeemed Interest Payable
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| - Definition
Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.
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| - Definition
Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.
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| - Definition
The rate of interest that was being paid on the original debt issue that is being converted in the noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.
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| - Definition
The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.
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| - Definition
The price per share of the conversion feature embedded in the debt instrument.
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| - Definition
Description of the frequency of periodic payments (monthly, quarterly, annual).
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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Face (par) amount of the original debt instrument that was repurchased.
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| - Definition
Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.
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| - Definition
The effective interest rate at the end of the reporting period.
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| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
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| - Definition
Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.
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| - Definition
The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.
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