Debt (Schedule of Carrying Values of Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Capital lease obligations	$ 107,200	$ 130,900
Total debt	1,080,200	1,023,200
Less unamortized deferred financing costs	(11,400)	(12,900)
Less current maturities	(70,367)	(77,400)
Long-term debt	$ 998,440	932,868
Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Oct. 29, 2018
Credit Facility [Member] \| Revolving Loans [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 307,600	208,500
Credit Facility [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Nov. 21, 2019
Carrying value of debt	$ 243,800	250,000
Senior Notes [Member] \| 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 15, 2023
Carrying value of debt	$ 400,000	400,000
Other Credit Facilities [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 10,100	16,400
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations, expiration date, range, end	Jun. 13, 2021
Notes Payable [Member] \| Equipment [Member]
Debt Instrument [Line Items]
Notes payable, maturity date, range, end	May 31, 2018
Carrying value of debt	$ 11,500	$ 17,400

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.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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