SEGMENT INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Gain on Sale of Assets
Total gain on sale					$ 1,171	$ 632	$ 1
Interest Income
Total interest income					853	550	499
Interest Expense
Total interest expense					43,799	45,221	39,231
Depreciation and Amortization
Total depreciation and amortization					14,457	16,512	18,536
Income (Loss) From Operations Before Taxes
Total income					48,036	45,311	27,823
Depreciation and amortization expense					(14,457)	(16,512)	(18,536)
Interest expense, net					(42,946)	(44,671)	(38,732)
Gain (loss) on sale of property and equipment					1,171	632	1
Gain (loss) debt restructure expense							(2,678)
Gain (loss) debt repayment					(440)
Gain on derivative instrument					3,871	3,899	(6,680)
Financing expense (recovery)	7,100	200	300	6,800		(19)	14,364
INCOME (LOSS) FROM OPERATIONS BEFORE INCOME TAXES					9,692	5,171	(20,266)
Assets
Total assets	222,018				230,361	222,963	222,018
Intangible assets					12,365	14,715
Receivable					31,523	32,972
Capital Expenditures
Total capital expenditures					10,512	4,900	4,543
Other asset expenditures						787	675
Reportable segments
Gain on Sale of Assets
Total gain on sale					1,169	630	1
Interest Income
Total interest income					2,598	2,880	3,131
Interest Expense
Total interest expense					2,535	2,221	2,247
Depreciation and Amortization
Total depreciation and amortization					11,136	13,210	15,410
Income (Loss) From Operations Before Taxes
Total income					66,602	65,357	61,797
Depreciation and amortization expense					(11,136)	(13,210)	(15,410)
Gain (loss) on sale of property and equipment					1,169	630	1
Assets
Total assets	363,737				398,059	377,756	363,737
Capital Expenditures
Total capital expenditures					10,512	4,113	3,868
Unallocated amount
Gain on Sale of Assets
Total gain on sale					2	2
Interest Income
Total interest income					847	544	499
Interest Expense
Total interest expense					42,475	44,206	38,185
Depreciation and Amortization
Total depreciation and amortization					3,321	3,302	3,126
Income (Loss) From Operations Before Taxes
Depreciation and amortization expense					(3,321)	(3,302)	(3,126)
G & A expense					(14,013)	(15,474)	(16,024)
Interest expense, net					(41,628)	(43,662)	(37,686)
Gain (loss) on sale of property and equipment					2	2
Gain (loss) debt restructure expense							(2,678)
Gain (loss) debt repayment					(440)
Gain on derivative instrument					3,871	3,899	(6,680)
Financing expense (recovery)						19	(13,939)
Assets
Intangible assets	12,409				8,851	10,881	12,409
Corporate unallocated
Assets
Total assets	6,415				8,625	8,602	6,415
Elimination of intercompany
Interest Income
Total interest income					(2,592)	(2,874)	(3,131)
Interest Expense
Total interest expense					(1,211)	(1,206)	(1,201)
Income (Loss) From Operations Before Taxes
Interest expense, net					(1,381)	(1,668)	(1,930)
Assets
Total assets	$ (160,543)				$ (185,174)	$ (174,276)	$ (160,543)