| **Long-Term Debt Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands** |                | 9 Months Ended |             |           |           |
|---------------------------------------------------------------------------------------------------|----------------|----------------|-------------|-----------|-----------|
||
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Convertible Note, Conversion Price                                                                |           | $ 85.39        |        |      |      |
| Debt Instrument, Maturity Date                                                                    |           | Sep. 15,  2021 |        |      |      |
| Line of Credit Facility, Initial Borrowing Base                                                   |           | $ 1,300,000    | $ 1,300,000 |      |      |
| Line of Credit, Initial Elected Commitment                                                        |           | 700,000        |        |      |      |
| Debt Issuance Costs, Line of Credit Arrangements, Net                                             |           | 8,600          |        | $ 6,200   |      |
| Swingline Facility                                                                                |           | $ 25,000       |        |      |      |
| Line of Credit Facility, Weighted Average Interest Rate                                           |           | 4.20%          |        |      |      |
| 5.75% Senior Notes due 2026 [Member]                                                              |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Debt Instrument, Interest Rate, Stated Percentage                                                 |           | 5.75%          |        |      |      |
| 1.125% Convertible Senior Notes due 2021 [Member]                                                 |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Debt Instrument, Interest Rate, Stated Percentage                                                 |           | 1.125%         |        |      |      |
| Debt Instrument, Issuance Date                                                                    |           | Sep. 12,  2016 |        |      |      |
| 6.125% Senior Notes due 2024 [Member]                                                             |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Debt Instrument, Interest Rate, Stated Percentage                                                 |           | 6.125%         |        |      |      |
| Debt Instrument, Issuance Date                                                                    | Sep. 12,  2016 |           |        |      |      |
| Revolving Credit Facility                                                                         |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Line of Credit Facility, Expiration Date                                                          |           | May 23,  2023  |        |      |      |
| Maximum Borrowing Base [Member] | Revolving Credit Facility                                       |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Line of Credit Facility, Maximum Borrowing Capacity                                               |           | $ 2,500,000    |        |      |      |
| First Payment | 1.125% Convertible Senior Notes due 2021 [Member]                                 |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Debt Instrument, Frequency of Periodic Payment                                                    |           | March 15       |        |      |      |
| First Payment | 6.125% Senior Notes due 2024 [Member]                                             |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Debt Instrument, Frequency of Periodic Payment                                                    |           | March 15       |        |      |      |
| Second Payment | 1.125% Convertible Senior Notes due 2021 [Member]                                |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Debt Instrument, Frequency of Periodic Payment                                                    |           | September 15   |        |      |      |
| Second Payment | 6.125% Senior Notes due 2024 [Member]                                            |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Debt Instrument, Frequency of Periodic Payment                                                    |           | September 15   |        |      |      |
| Revolving Credit Facility                                                                         |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Long-term Line of Credit                                                                          |           | $ 75,000       |        | 0         |      |
| 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      |        |      |      |
| Unamortized Debt Issuance Expense                                                                 |           | (2,884)        |        | (3,615)   | $ (4,800) |
| 6.125% Senior Notes due 2024 [Member]                                                             |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Unamortized Debt Issuance Expense                                                                 |           | (5,835)        |        | (6,570)   | $ (7,800) |
| Senior Notes ($)                                                                                  |           | $ 400,000      |        | $ 400,000 |      |
| Alternate Base Rate Option [Member]                                                               |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Line of Credit Facility, Interest Rate at Period End                                              |           | 0.25%          |        |      |      |
| LIBOR Option [Member]                                                                             |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Line of Credit Facility, Interest Rate at Period End                                              |           | 1.25%          |        |      |      |
| Unused Commitment Fee [Member]                                                                    |           |           |        |      |      |
| **Debt Instrument**                                                                               |           |           |        |      |      |
| Line of Credit Facility, Interest Rate at Period End                                              |           | 0.375%         |        |      |      |

| X                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Liability component of the gross proceeds of Convertible Notes prior to their maturity date.
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| - Definition
Line of Credit Facility, Initial Borrowing Base
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| X                                                                                                                                                                                                                                                                                      |
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| - Definition
Line of Credit Facility, Weighted Average Interest Rate
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| X                                                                                                                                                                                                                                                                     |
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| - Definition
Line of Credit, Initial Elected Commitment
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| X                                                                                                                                                                                                                          |
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| - Definition
Swingline Facility
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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 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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| - Definition
Date the debt instrument was issued, in CCYY-MM-DD format.
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| - Definition
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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| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
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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
Date the credit facility terminates, in CCYY-MM-DD format.
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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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