LONG TERM DEBT - Credit Agreement, As Amended To Date (Details) - Credit Agreement, As Amended To Date	Jul. 01, 2017	Jan. 01, 2017	Jul. 15, 2016 USD ($) item	Dec. 31, 2016 USD ($)
Long-Term Debt
Initial amount borrowed			$ 225,000,000
Percentage tax refunds to be applied to reduce revolving commitments			50.00%
Minimum commitment as a result of tax refunds			$ 108,000,000
Number of consecutive quarters to meet leverage ratio | item			4
Maximum leverage ratio to use maximum credit facility			$ 4.00
Increase in interest rate		0.50%
Increase in interest rate for failure to delivery financial information on or before June 30, 2017	0.50%
Interest rate in excess of applicable rate upon acceleration and default			2.00%
Minimum
Long-Term Debt
Quarterly principal payments, as a percent to initial amount borrowed			0.625%
Reduction of the available credit facility depending on fiscal quarter results			$ 10,700,000
Maximum
Long-Term Debt
Quarterly principal payments, as a percent to initial amount borrowed			3.75%
Reduction of the available credit facility depending on fiscal quarter results			$ 20,700,000
Last day of the fiscal quarter ending June 30, 2016
Long-Term Debt
Consolidated leverage ratio			5.00%
Interest coverage ratio			3.50
Quarters ending September 30, 2016, December 31, 2016, March 31, 2017 and June 30, 2017
Long-Term Debt
Interest coverage ratio			2.25
Last day of the fiscal quarter ending September 30, 2016
Long-Term Debt
Consolidated leverage ratio			5.75%
Last day of the fiscal quarters ending December 31, 2016 and March 31, 2017
Long-Term Debt
Consolidated leverage ratio			5.00%
Last day of the fiscal quarters ending June 30, 2017
Long-Term Debt
Consolidated leverage ratio			4.50%
Last day of each fiscal quarter after June 30, 2017
Long-Term Debt
Interest coverage ratio			2.50
Last day of the fiscal quarter ending September 30, 2017
Long-Term Debt
Consolidated leverage ratio			4.25%
Last day of each fiscal quarter after September 30, 2017
Long-Term Debt
Consolidated leverage ratio			4.00%
LIBOR
Long-Term Debt
Interest rate margin (as a percent)		5.25%	4.75%
Interest rate margin contingent on delivery of financial information and leverage ratio of 4.00 to 1.00			4.00%
Base rate
Long-Term Debt
Interest rate margin (as a percent)		4.25%
Interest rate margin contingent on delivery of financial information and leverage ratio of 4.00 to 1.00			3.00%
Federal funds rate
Long-Term Debt
Interest rate margin (as a percent)			0.50%
One-month LIBOR
Long-Term Debt
Interest rate margin (as a percent)			3.75%
Revolving Credit Facility
Long-Term Debt
Maximum borrowing capacity				$ 118,300,000
Term Loan
Long-Term Debt
Maximum borrowing capacity			$ 225,000,000
Final payment at maturity			$ 143,400,000