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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
(Level 1) | Recurring basis
Fair value measurement of assets and liabilities
Interest rate swaps asset	$ 0	$ 0
Interest rate swaps liability	0	0
(Level 1) | Nonrecurring basis
Fair value measurement of assets and liabilities
Impaired long-lived assets	0	0
Long-term receivable from the sale of our Canadian Operations	0	0
(Level 2) | Recurring basis
Fair value measurement of assets and liabilities
Interest rate swaps asset	0	712
Interest rate swaps liability	(10,988)	(5,108)
(Level 2) | Nonrecurring basis
Fair value measurement of assets and liabilities
Impaired long-lived assets	0	0
Long-term receivable from the sale of our Canadian Operations	0	0
(Level 3) | Recurring basis
Fair value measurement of assets and liabilities
Interest rate swaps asset	0	0
Interest rate swaps liability	0	0
(Level 3) | Nonrecurring basis
Fair value measurement of assets and liabilities
Impaired long-lived assets	6,156		$ 2,472
Long-term receivable from the sale of our Canadian Operations	$ 5,100	$ 0

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 55



-Paragraph 22



-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226052-175313



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-Name Accounting Standards Codification



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-Section 50



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- Definition

Fair value of 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, not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 55



-Paragraph 22



-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226052-175313



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 20



-Section 50



-Paragraph 3



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