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

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

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

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No definition available.

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

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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.

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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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Debt (Schedule of Carrying Values of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Maturity Date
Capital lease obligations	$ 176,500				$ 126,000
Total debt	1,134,800				816,800
Less current maturities	(73,631)	$ (71,798)	$ (76,914)	$ (52,949)	(51,376)
Long-term debt	$ 1,061,159	$ 1,088,289	$ 1,088,666	$ 841,335	765,425
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	$ 282,700				53,000
Credit Facility [Member] \| Term Loan [Member]
Maturity Date
Line of credit facility, maturity date	Nov. 21, 2019
Carrying value of debt	$ 250,000				0
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
Convertible Debt [Member] \| 2011 4.0% Notes [Member]
Maturity Date
Debt instrument, maturity date	Jun. 15, 2014
Carrying value of debt	$ 0				103,800
Convertible Debt [Member] \| 2011 4.25% Notes [Member]
Maturity Date
Debt instrument, maturity date	Dec. 15, 2014
Carrying value of debt	$ 0				94,500
Convertible Debt [Member] \| 2009 4.0% Notes [Member]
Maturity Date
Debt instrument, maturity date	Jun. 15, 2014
Carrying value of debt	$ 0				9,600
Convertible Debt [Member] \| 2009 4.25% Notes [Member]
Maturity Date
Debt instrument, maturity date	Dec. 15, 2014
Carrying value of debt	$ 0				3,000
Other Credit Facilities [Member]
Maturity Date
Carrying value of debt	$ 1,200				0
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	May 01, 2018
Carrying value of debt	$ 24,400				$ 26,900