Asset Retirement Obligation Additional Obligations Excluding Obligations Assumed from Acquisitions

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- Definition

The estimated fair value of contingent consideration payable in a business combination as of the balance sheet date.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB
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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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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.

+ References

No definition available.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Acquisition-related contingent consideration
Liabilities associated with acquisition-related contingent consideration	$ (42,434)
Additions to asset retirement obligations liability
Total additional asset retirement obligations incurred for the period	9,379
Level 3 [Member]
Acquisition-related contingent consideration
Liabilities associated with acquisition-related contingent consideration	(42,434)
Additions to asset retirement obligations liability
Total additional asset retirement obligations incurred for the period	9,400	$ 6,000
Interest Rate Swap Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets associated with interest rate swap contracts	14,575		$ 14,137
Liabilities associated with interest rate swap contracts	(18,701)		(30,989)
Interest Rate Swap Contracts [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets associated with interest rate swap contracts	14,575		14,137
Liabilities associated with interest rate swap contracts	(18,701)		$ (30,989)
Senior Notes 5.125 Percent Due 2022 \| Level 2 [Member]
Long-term debt
Fair value of long term notes	258,400
Convertible Senior Notes 1.00 percent due 2020 \| Level 2 [Member]
Long-term debt
Fair value of long term notes	265,700
Senior Notes 5.50 Percent Due 2025 \| Level 2 [Member]
Long-term debt
Fair value of long term notes	$ 307,700