LONG-TERM DEBT / INTEREST EXPENSE SCHEDULE OF INTEREST EXPENSE (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 10, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument
Amortization of discount and deferred financing fees		$ 6,421	$ 1,729	$ 2,507
Interest income		(204)	(253)	(254)
Interest expense, net		50,936	46,708	53,029
Payments on long-term debt		169,060	5,443	3,379
Accelerated amortization		0	0	5,712
Senior Credit Facility
Debt Instrument
Loss on debt refinancing		0	0	5,712
Amortization of discount and deferred financing fees		2,583	1,729	4,712
Interest and Debt Expense		45,535	46,838	53,124
Term Loan coupon
Debt Instrument
Payments on long-term debt	$ 164,300
Accelerated amortization	$ (800)
Term Loan coupon | Senior Credit Facility
Debt Instrument
Interest expense, excluding amortization		42,147	44,427	42,020
Convertible senior notes | 1.5% Convertible Senior Notes Due 2020
Debt Instrument
Interest expense, excluding amortization		1,702	0	0
Amortization of conversion feature		3,410	0	0
Amortization of discount and deferred financing fees		412	0	0
Interest and Debt Expense		5,524	0	0
Mortgage and other interest expense
Debt Instrument
Interest expense, excluding amortization		81	123	159
Revolver | Senior Credit Facility
Debt Instrument
Interest expense, excluding amortization		$ 805	$ 682	$ 680