Long-term Debt - Narrative (Details)	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Carrying value	$ 386,107,000		$ 387,097,000
Amortization of debt issuance costs	30,000	$ 30,000
Amended Facility
Debt Instrument [Line Items]
Carrying value	386,100,000		387,100,000
Unrestricted cash and cash equivalents limit for the secured leverage ratio	$ 40,000,000
Secured leverage ratio	3.75
Amended Facility | Term loan
Debt Instrument [Line Items]
Carrying value	$ 386,100,000		387,100,000
Fair value	$ 386,100,000		$ 385,200,000
Effective interest rate	3.86%		3.87%
Quarterly principal payment	$ 1,000,000
End of term payment	373,200,000
Amended Facility | Revolving credit facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 0		$ 0