Debt (Outstanding Debt Including Capital Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Weighted average coupon interest rate	3.39%
Debt instrument, discount	$ (11,882)	$ (12,194)
Total outstanding debt, net	965,826	861,569
Capital lease and lease financing obligations	38,708	49,761
Total debt and lease obligations	$ 977,708	873,763
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.22%
Maturity date	Dec. 17, 2020
Outstanding debt	$ 139,000	224,002
Term Loan I [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.19%
Maturity date	Dec. 17, 2021
Outstanding debt	$ 300,000	150,000
Term Loan II [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	2.25%
Maturity date	Apr. 27, 2022
Outstanding debt	$ 200,000	150,000
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding debt	$ 639,000
Unsecured Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 17, 2019
Senior Notes [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	5.88%
Maturity date	Aug. 01, 2022
Outstanding debt	$ 300,000	300,000
Capital Lease and Lease Financing Obligations [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate	3.52%
Maturity date description	2017 - 2025
Capital lease and lease financing obligations	$ 38,708	$ 49,761

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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- Definition

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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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount, after accumulated amortization, of debt discount (premium).

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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