Revolving Line of Credit and Long Term Debt - Terms (Details) - USD ($)		3 Months Ended
	Jul. 31, 2015	Mar. 31, 2016	Dec. 31, 2015
2015 Credit Agreement | LIBOR
Long-term debt
Variable rate, basis spread (as a percent)		1.50%
2015 Credit Agreement | Adjusted Base Rate (ABR)
Long-term debt
Variable rate, basis spread (as a percent)		0.50%
Term Loan | 2015 Credit Agreement
Long-term debt
Term of debt instrument	5 years
Face amount of debt	$ 185,000,000
Frequency of periodic payment		quarterly
Periodic payment required		$ 2,300,000
Long-term debt, amount outstanding		180,375,000	$ 182,688,000
Term Loan | First Lien Credit Agreement
Long-term debt
Payments on debt	$ 183,200,000
Revolving Credit Facility | 2015 Credit Agreement
Long-term debt
Term of debt instrument	5 years
Maximum borrowing capacity	$ 75,000,000
Long-term debt, amount outstanding		0
Letters of credit outstanding		65,000
Available borrowing capacity		$ 74,900,000
Commitment fee, unused amounts (as a percent)		0.375%