Credit Facility (Details)		12 Months Ended
	Aug. 27, 2015 USD ($)	Dec. 31, 2015 USD ($)	Aug. 26, 2015	Dec. 31, 2014 USD ($)	Apr. 14, 2014 USD ($)
Line of Credit Facility [Line Items]
Maximum capacity on credit facility					$ 705,000,000
Additional borrowing capacity under certain circumstances					1,000,000,000
Debt service coverage ratio	1.3		1.40
Credit facility settled		$ 150,000,000
Credit facility		485,000,000		$ 635,000,000
Term Loan
Line of Credit Facility [Line Items]
Maximum capacity on credit facility					305,000,000
Credit facility		$ 305,000,000		$ 305,000,000
Line of Credit
Line of Credit Facility [Line Items]
Effective interest rate		2.39%		2.08%
Remaining borrowing capacity		$ 63,000,000
Credit Facility
Line of Credit Facility [Line Items]
Maximum capacity on credit facility					$ 400,000,000
Credit facility		$ 180,000,000		$ 330,000,000
Credit Facility Amendment
Line of Credit Facility [Line Items]
Debt issuance cost	$ 6,300,000
Credit Facility Amendment | Acquisition fees and related cost reimbursements
Line of Credit Facility [Line Items]
Debt issuance cost	2,400,000
Deferred Costs | Credit Facility Amendment
Line of Credit Facility [Line Items]
Deferred finance costs	$ 4,000,000
One-Month LIBOR | Line of Credit Facility, Base Rate, Option Three | Line of Credit
Line of Credit Facility [Line Items]
Spread on variable rate basis		1.00%
Federal Funds Effective Rate | Line of Credit Facility, Base Rate, Option Two | Line of Credit
Line of Credit Facility [Line Items]
Spread on variable rate basis		0.50%
London Interbank Offered Rate (LIBOR) | Line of Credit
Line of Credit Facility [Line Items]
Unused capacity commitment fee percentage threshold		50.00%
London Interbank Offered Rate (LIBOR) | Below Threshold | Line of Credit
Line of Credit Facility [Line Items]
Unused capacity fee percentage		0.15%
London Interbank Offered Rate (LIBOR) | Above Threshold | Line of Credit
Line of Credit Facility [Line Items]
Unused capacity fee percentage		0.25%
London Interbank Offered Rate (LIBOR) | Line of Credit Facility, Interest Rate, Option One | Line of Credit | Maximum
Line of Credit Facility [Line Items]
Spread on variable rate basis		2.25%
London Interbank Offered Rate (LIBOR) | Line of Credit Facility, Interest Rate, Option One | Line of Credit | Minimum
Line of Credit Facility [Line Items]
Spread on variable rate basis		1.50%
Base Rate | Line of Credit Facility, Interest Rate, Option Two | Line of Credit | Maximum
Line of Credit Facility [Line Items]
Spread on variable rate basis		1.25%
Base Rate | Line of Credit Facility, Interest Rate, Option Two | Line of Credit | Minimum
Line of Credit Facility [Line Items]
Spread on variable rate basis		0.50%