Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Capital assets and other	$ 34,563	$ 33,567
Net operating loss carry forwards	43,280	50,274
Interest deductions	19,285	17,255
Deferred acquisition consideration	21,418	5,070
Stock compensation	2,317	2,356
Pension plan	2,168	0
Unrealized foreign exchange	843	753
Capital loss carry forwards	17,408	16,921
Accounting reserves	4,721	6,493
Gross deferred tax asset	146,003	132,689
Less: valuation allowance	(134,761)	(113,585)
Net deferred tax assets	11,242	19,104
Deferred tax liabilities:
Deferred finance charges	(449)	(514)
Capital assets	(348)	(417)
Goodwill amortization	(53,875)	(53,181)
Total deferred tax liabilities	(54,672)	(54,112)
Net deferred tax asset (liability)	(43,430)	(35,008)
Disclosed as:
Deferred tax assets	9,637	15,767
Deferred tax liabilities	(53,067)	(50,775)
Net deferred tax asset (liability)	$ (43,430)	$ (35,008)

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from deferred acquisition consideration, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

No definition available.