Derivative Instruments, Hedging Activities and Other Comprehensive Income (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Jan. 31, 2016 USD ($) swap	Dec. 31, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, average cap interest rate	3.17%		3.17%
Hedge liability at fair value	$ 11,000,000		$ 11,000,000
Hedge derivative at fair value, net						$ 4,800,000
Gain (loss) reclassified from accumulated OCI into income, effective portion, net			3,500,000	$ 4,200,000
Interest expense	17,139,000	$ 13,881,000	47,964,000	$ 40,995,000
Prepaid Expenses and Other Current Assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge asset at fair value						200,000
Accounts Payable and Accrued Liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge liability at fair value	11,000,000		11,000,000			5,000,000
Accrued Interest
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge derivative at fair value, net	400,000		400,000			$ 400,000
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount					$ 150,000,000
Number of Interest Rate Derivatives Held | swap					2
Derivative, Variable Interest Rate					3.208%
Increase As Hedged Forecasted Interest Payments Occur
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense			3,700,000
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 474,700,000.0		$ 474,700,000.0