Debt - Schedule of Debt (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Feb. 25, 2016	Oct. 22, 2015
Debt Instrument [Line Items]
Total Debt	$ 474,728,000	$ 460,428,000
Unamortized deferred financing costs	(3,441,000)	(3,956,000)
Total debt	$ 471,287,000	$ 456,472,000
Term to determine contractual rate		360 days
Weighted average interest rate (percent)	3.02%
Term to determine weighted average interest rate	365 days
Interest Rate Swap
Debt Instrument [Line Items]
Notional amount	$ 100,000,000.0		$ 100,000,000.0
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Base rate (percent)	1.06%
Line of Credit | Key Bank Credit Facility
Debt Instrument [Line Items]
Total Debt	$ 347,758,000	$ 333,458,000
Contractual interest rate	2.66%
Effective interest rate (percent)	3.09%
Weighted average interest rate (percent)	2.70%
Term of loan	4 years
Revolving credit facility, extension term	1 year
Line of Credit | Key Bank Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.60%
Notes Payable, Other Payables | AIG Loan
Debt Instrument [Line Items]
Total Debt		$ 126,970,000
Total debt				$ 127,000,000
Contractual interest rate	4.15%
Effective interest rate (percent)	4.22%
Duration monthly payments of interest only	5 years