Debt - Summary of Debt and Capital Lease Obligations - Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Capital lease obligations	$ 623	$ 639
Total Debt	1,693,427	1,591,392
Line of Credit [Member] \| Revolving Credit Facility [Member] \| $700 Million Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	262,815	161,924
Secured Debt [Member] \| $200 Million Term Loan A [Member]
Debt Instrument [Line Items]
Long-term Debt	198,695	198,443
Secured Debt [Member] \| $500 Million Term Loan B [Member]
Debt Instrument [Line Items]
Long-term Debt	488,223	488,655
Senior Notes [Member] \| $350 Million 5% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	347,376	346,660
Senior Notes [Member] \| $400 Million 5% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 395,695	$ 395,071

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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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.

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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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