Debt (Schedule of Carrying Values of Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Maturity Date
Capital lease obligations	$ 160,400	$ 176,500
Total debt	1,215,200	1,134,800
Less current maturities	(78,362)	(73,631)
Long-term debt	$ 1,136,783	1,061,159
Credit Facility [Member]
Maturity Date
Line of credit facility, maturity date	Oct. 29, 2018
Credit Facility [Member] \| Revolving Loans [Member]
Maturity Date
Carrying value of debt	$ 356,100	282,700
Credit Facility [Member] \| Term Loan [Member]
Maturity Date
Line of credit facility, maturity date	Nov. 21, 2019
Carrying value of debt	$ 250,000	250,000
Senior Notes [Member] \| 4.875% Senior Notes [Member]
Maturity Date
Debt instrument, maturity date	Mar. 15, 2023
Carrying value of debt	$ 400,000	400,000
Other Credit Facilities [Member]
Maturity Date
Carrying value of debt	$ 26,000	1,200
Capital Lease Obligations [Member]
Maturity Date
Capital lease obligations, expiration date, range, end	Jun. 13, 2021
Notes Payable [Member] \| Equipment [Member]
Maturity Date
Notes payable, maturity date, range, end	Jun. 30, 2018
Carrying value of debt	$ 22,700	$ 24,400

-- None. No documentation exists for this element. --

No definition available.

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- Definition

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.

+ References

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-Publisher FASB

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-Section 03

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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-Name Accounting Standards Codification

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- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

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- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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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.

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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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No definition available.

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