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Amount of liability recognized arising from contingent consideration in a business combination.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Acquisition-related contingent consideration
Liabilities associated with acquisition-related contingent consideration	$ (37,351)
Additions to asset retirement obligations liability
Total additional asset retirement obligations incurred for the period	2,800	$ 1,000
Level 3
Acquisition-related contingent consideration
Liabilities associated with acquisition-related contingent consideration	(37,351)
Interest Rate Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets associated with interest rate swap contracts	12,143		$ 14,137
Liabilities associated with interest rate swap contracts	(28,039)		(30,989)
Interest Rate Swap Contracts \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets associated with interest rate swap contracts	12,143		14,137
Liabilities associated with interest rate swap contracts	(28,039)		$ (30,989)
Senior Notes 5.125 Percent Due 2022 \| Level 2
Long-term debt
Fair value of long term notes	253,800
Convertible Senior Notes 1.00 percent due 2020 \| Level 2
Long-term debt
Fair value of long term notes	$ 313,300