| **Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands** | Sep. 30, 2018 | Dec. 31, 2017 | Nov. 14, 2017 | Sep. 14, 2016 |
|-------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **Debt Instrument**                                               |          |          |          |          |
| Total senior notes                                                | $ 1,159,733   | $ 1,151,932   |          |          |
| Total debt, net of discount and unamortized debt issuance costs   | 1,234,733     | 1,151,932     |          |          |
| Long-term debt                                                    | 1,234,733     | 1,151,932     |          |          |
| 1.125% Convertible Senior Notes due 2021 [Member]                 |          |          |          |          |
| **Debt Instrument**                                               |          |          |          |          |
| Principal amount                                                  | 200,000       | 200,000       |          |          |
| Unamortized Discount                                              | (24,697)      | (30,328)      |          |          |
| Unamortized Debt Issuance Expense                                 | (2,884)       | (3,615)       |          | $ (4,800)     |
| Convertible senior notes net of discount                          | 172,419       | 166,057       |          |          |
| 5.75% Senior Notes due 2026 [Member]                              |          |          |          |          |
| **Debt Instrument**                                               |          |          |          |          |
| Unamortized Debt Issuance Expense                                 | (6,851)       | (7,555)       |          |          |
| Principal amount                                                  | 600,000       | 600,000       | $ 7,600       |          |
| Senior notes, net of unamortized debt issuance costs              | 593,149       | 592,445       |          |          |
| 6.125% Senior Notes due 2024 [Member]                             |          |          |          |          |
| **Debt Instrument**                                               |          |          |          |          |
| Unamortized Debt Issuance Expense                                 | (5,835)       | (6,570)       |          | $ (7,800)     |
| Principal amount                                                  | 400,000       | 400,000       |          |          |
| Senior notes, net of unamortized debt issuance costs              | 394,165       | 393,430       |          |          |
| Revolving Credit Facility                                         |          |          |          |          |
| **Debt Instrument**                                               |          |          |          |          |
| Revolving credit facility                                         | $ 75,000      | $ 0           |          |          |

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| - Definition
Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.
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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
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
Amount, after accumulated amortization, of debt discount.
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| - Definition
Represents the aggregate of total long-term debt, including current maturities and short-term debt.
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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
Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.
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| - Definition
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), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.
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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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