Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Capital leases	$ 4,953	$ 3,752
Other debt	5,605	3,500
Revolving Credit Agreement	0	0
Total debt	1,510,558	1,119,098
Debt issuance costs on senior unsecured notes	(19,725)	(14,388)
Premium on senior unsecured notes	3,570	3,828
Less: current portion	(3,806)	(67,214)
Total long-term debt	1,490,597	1,041,324
Senior Notes \| 7.500% senior unsecured notes due 2022
Debt Instrument [Line Items]
Senior unsecured notes	$ 0	61,846
Debt instrument interest rate stated percentage	7.50%
Senior Notes \| 6.250% senior unsecured notes due 2024
Debt Instrument [Line Items]
Senior unsecured notes	$ 400,000	400,000
Debt instrument interest rate stated percentage	6.25%
Senior Notes \| 5.375% senior unsecured notes due 2025
Debt Instrument [Line Items]
Senior unsecured notes	$ 650,000	650,000
Debt instrument interest rate stated percentage	5.375%
Senior Notes \| 5.250% senior unsecured notes due 2025
Debt Instrument [Line Items]
Senior unsecured notes	$ 450,000	$ 0
Debt instrument interest rate stated percentage	5.25%

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Amount of long-term debt and capital lease obligations including current maturities.

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Amount of long-term debt classified as other.

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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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