Long-Term Obligations (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Summary of long-term obligations
Debt Obligations	$ 735,230	$ 557,144
Capital lease obligations and other debt	59,538	62,501
Long term debt including capital lease obligation	794,768us-gaap_DebtAndCapitalLeaseObligations	619,645us-gaap_DebtAndCapitalLeaseObligations
Less - current portion	(19,356)	(51,087)
Current portion of long-term debt	775,412	568,558
Senior Notes [Member]
Summary of long-term obligations
Debt Obligations	600,000	556,914
Effective interest rate (percentage)	1.67%	1.92%
Secured Seller Notes [Member]
Summary of long-term obligations
Debt Obligations	230	230
Stated interest rate (percentage)	10.00%	10.00%
Revolving line of credit [Member]
Summary of long-term obligations
Debt Obligations	$ 135,000	$ 0
Effective interest rate (percentage)	1.67%

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 45

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

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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- Definition

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

+ References

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-Publisher SEC

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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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- Definition

Capital Debt Obligations and Other Borrowings

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No definition available.

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