Long-Term Debt (Details) $ in Thousands			1 Months Ended		12 Months Ended
	Feb. 14, 2017 USD ($) item	Jul. 31, 2014 USD ($)	Mar. 31, 2016 USD ($)	Jul. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Jul. 30, 2013 USD ($) item
Long-term debt
Less: Current portion							$ (8,278)
Long-term debt less current portion					$ 210,270		209,391
Assets					530,441		548,896
Liabilities					261,101		270,255
Deferred financing costs					1,800		2,300
Accumulated amortization					1,500		1,000
Loss on early extinguishment of debt						$ 1,116
Payment of excess cash flow			$ 8,300
Maturities of long-term debt
2019					722
2020					212,625
Total maturities					213,347
ASU 2015-03 | Adjustment
Long-term debt
Assets					(2,300)
Liabilities					(2,300)
Existing Senior Secured Term Loan B Facility
Long-term debt
Long-term Debt					210,270		$ 217,669
Amount of term loan		$ 225,000		$ 225,000
Interest rate margin (as a percent)		4.00%
Effective interest rate (as a percent)		5.00%		5.00%
OID (as a percent)		0.50%		0.50%
Uncommitted accordion option base amount								$ 40,000
Uncommitted accordion option multiplier of net leverage ratio | item								4.0
Borrowing capacity		$ 20,000		$ 20,000
OID					1,300
Accumulated amortization of original issue discount					1,100
Deferred financing costs					1,800
Accumulated amortization					$ 1,500
Loss on early extinguishment of debt				1,100
Write off of deferred costs associated with debt extinguishment				700
Write off of debt discount associated with debt extinguishment				400
Maximum period after each fiscal year for prepayment of debt					90 days
Prepayment of debt as a percentage of excess cash flow					50.00%
First prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained					25.00%
Second prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained					0.00%
Existing Senior Secured Term Loan B Facility | LIBOR
Long-term debt
Interest rate floor (as a percent)		1.00%
Existing Senior Secured Term Loan B Facility | Alternate Base Rate (ABR)
Long-term debt
Interest rate margin (as a percent)		3.00%
Amended Term Loan Facility
Long-term debt
Debt caps amount		$ 45,000		$ 45,000
Amended Term Loan Facility | Subsequent event
Long-term debt
Amount of term loan	$ 213,300
OID (as a percent)	0.50%
Uncommitted accordion option base amount	$ 65,000
Borrowing capacity	$ 30,000
Amortization payments (in percentage)	1.00%
Period for prepayments prior to closing date	6 months
Prepayment premium (in percentage)	1.00%
Maturities of long-term debt
2017	$ 2,133
2018	2,133
2019	2,133
2020	2,133
2021 and thereafter	204,815
Total maturities	$ 213,347
Amended Term Loan Facility | First Lien Net Leverage Ratio | Subsequent event
Long-term debt
Uncommitted accordion option multiplier of net leverage ratio | item	4.00
Number of consecutive fiscal quarters | item	4
Amended Term Loan Facility | Total Net Leverage Ratio | Subsequent event
Long-term debt
Uncommitted accordion option multiplier of net leverage ratio | item	6.00
Number of consecutive fiscal quarters | item	4
Amended Term Loan Facility | First Lien and Total Net Leverage Ratio | Subsequent event
Long-term debt
Debt caps amount	$ 60,000
Amended Term Loan Facility | LIBOR | Subsequent event
Long-term debt
Interest rate margin (as a percent)	3.50%
Interest rate floor (as a percent)	0.00%
Amended Term Loan Facility | Alternate Base Rate (ABR) | Subsequent event
Long-term debt
Interest rate margin (as a percent)	2.50%