Long-term Debt - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Carrying value	$ 384,127,000		$ 384,127,000		$ 387,097,000
Amortization of debt issuance costs	30,000	$ 30,000	91,000	$ 91,000
Amended Facility
Debt Instrument [Line Items]
Carrying value	384,100,000		384,100,000		387,100,000
Unrestricted cash and cash equivalents limit for the secured leverage ratio	$ 40,000,000		$ 40,000,000
Secured leverage ratio	3.75		3.75
Amended Facility | Term loan
Debt Instrument [Line Items]
Carrying value	$ 384,100,000		$ 384,100,000		387,100,000
Fair value	$ 385,600,000		$ 385,600,000		$ 385,200,000
Effective interest rate	3.63%		3.63%		3.87%
Quarterly principal payment			$ 1,000,000
End of term payment	$ 373,200,000		373,200,000
Amended Facility | Revolving credit facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 0		$ 0		$ 0