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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Debt (Outstanding Debt Including Capital Leases) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended	17 Months Ended	63 Months Ended
	Oct. 31, 2015	Dec. 31, 2015	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Weighted average coupon interest rate		3.31%	3.31%
Capital lease and lease financing obligations		$ 49,761	$ 49,761		$ 13,062
Total debt and lease obligations		$ 871,739	$ 871,739		637,229
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate		1.82%	1.82%
Maturity date		Dec. 17, 2019
Outstanding debt		$ 224,002	$ 224,002		139,838
Term Loan I [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate		1.78%	1.78%
Maturity date		Dec. 17, 2020
Outstanding debt		$ 150,000	$ 150,000		$ 100,000
Term Loan II [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate		1.92%	1.92%
Maturity date		Apr. 27, 2021
Outstanding debt		$ 150,000	$ 150,000
Richmond Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding debt					$ 70,000
Unsecured Credit Facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity date	Dec. 17, 2019
Senior Notes Net of Discount [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate		5.88%	5.88%
Maturity date		Aug. 01, 2022
Outstanding debt		$ 297,976	$ 297,976		297,729
Senior Notes [Member]
Debt Instrument [Line Items]
Maturity date			Aug. 01, 2022
Atlanta-Metro Equipment Loan [Member]
Debt Instrument [Line Items]
Maturity date				Jun. 01, 2020
Outstanding debt					16,600
Capital Lease and Lease Financing Obligations [Member]
Debt Instrument [Line Items]
Weighted average coupon interest rate		3.35%	3.35%
Maturity date decription		2016 - 2025
Capital lease and lease financing obligations		$ 49,761	$ 49,761		$ 13,062