LONG-TERM DEBT OBLIGATIONS - Term Loan - 2012 - Narrative (Details) (USD $)	0 Months Ended	12 Months Ended			22 Months Ended		0 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended		0 Months Ended									0 Months Ended			0 Months Ended
	Jun. 25, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 17, 2013	Dec. 31, 2013 4.00% Convertible Senior Notes [Member]	Jun. 25, 2012 Refinanced Term Loan [Member]	Oct. 17, 2013 Refinanced Term Loan [Member]	Oct. 17, 2013 Revolving Credit Facility [Member]	Dec. 31, 2013 Senior Secured Credit Facility [Member]	Jun. 25, 2012 Senior Secured Credit Facility [Member]	Jun. 25, 2012 Term Loan [Member]	Dec. 31, 2013 Term Loan [Member]	Oct. 17, 2013 Base Rate [Member]	Oct. 17, 2013 Federal Funds Rate [Member] Senior Secured Credit Facility [Member]	Oct. 17, 2013 London Interbank Offered Rate (LIBOR) [Member]	Oct. 17, 2013 London Interbank Offered Rate (LIBOR) [Member] Debt Instrument, Redemption, Period One [Member]	Oct. 17, 2013 London Interbank Offered Rate (LIBOR) [Member] Debt Instrument, Redemption, Period Two [Member]	Oct. 17, 2013 London Interbank Offered Rate (LIBOR) [Member] Debt Instrument, Redemption, Period Three [Member]	Oct. 17, 2013 London Interbank Offered Rate (LIBOR) [Member] Debt Instrument, Redemption, Period Four [Member]	Oct. 17, 2013 London Interbank Offered Rate (LIBOR) [Member] Senior Secured Credit Facility [Member]	Oct. 17, 2013 Minimum [Member] Senior Secured Credit Facility [Member]	Oct. 17, 2013 Minimum [Member] Base Rate [Member]	Oct. 17, 2013 Minimum [Member] London Interbank Offered Rate (LIBOR) [Member]	Oct. 17, 2013 Maximum [Member] Senior Secured Credit Facility [Member]	Oct. 17, 2013 Maximum [Member] Base Rate [Member]	Oct. 17, 2013 Maximum [Member] London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Original aggregate principal amount of term loan	$ 85,000,000							$ 38,000,000	$ 10,000,000
Original revolving credit facility	15,000,000
Maturity period	5 years								5 years
Amount of term loan borrowed as of balance sheet date	85,000,000		85,000,000
Interest rate during period					6.50%
Basis spread on variable rate														2.75%	0.50%	3.75%					1.00%		2.50%	3.50%		2.75%	3.75%
Sum of LIBOR interest period																					1 month
Sum of LIBOR interest period advance determination																	1 month	2 months	3 months	6 months
Interest rate at period end		4.38%
Interest coverage ratio																						3.5
Senior Leverage Ratio																						1.20			1.75
Minimum prepayment percentage of excess cash flow											50.00%
Minimum prepayment percentage of net cash proceeds of issuances or incurrences of debt obligations											100.00%
Minimum prepayment percentage of net proceeds of asset sales over threshold amount											100.00%
Net proceeds of asset sales threshold to trigger prepayment											2,500,000.0
Interest rate						4.00%
Debt issuance cost related to term loan	4,500,000
Amortization period for debt issuance cost term loan	5 years
Debt issuance cost							800,000					2,500,000
Interest expense incurred		7,900,000	3,600,000
Annual amortization													10.00%
Amortization fifth year													60.00%
Repayments of secured debt		81,826,000	11,724,000	0						33,900,000
Outstanding principal balance of term loan as of balance sheet date		$ 12,800,000