Derivative Instruments, Hedging Activities and Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, average cap interest rate	3.12%		3.12%
Hedge derivative at fair value, net	$ 100		$ 100		$ 2,200
Gain (loss) reclassified from accumulated OCI into income, effective portion, net			2,100	$ 3,500
Interest expense	16,372	$ 17,139	49,250	$ 47,964
Increase As Hedged Forecasted Interest Payments Occur
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense			300
Prepaid Expenses and Other Current Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge asset at fair value	1,300		1,300		900
Accounts Payable and Accrued Liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge liability at fair value	1,200		1,200		3,100
Accrued Interest
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge derivative at fair value, net	200		200		$ 400
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 460,500		$ 460,500