Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Capital assets and other	$ 41,443	$ 43,031
Net operating loss carry forwards	41,989	37,490
Interest deductions	17,227	17,347
Refinancing charge	7,413	144
Deferred acquisition consideration	26,203	16,197
Stock compensation	2,581	3,033
Pension plan	5,095	3,770
Deferred Tax Assets, Unrealized Currency Losses	15,237	15,548
Capital loss carry forwards	10,957	10,630
Accounting reserves	7,138	6,701
Gross deferred tax asset	175,283	153,891
Less: valuation allowance	(133,490)	(124,143)
Net deferred tax assets	41,793	29,748
Deferred tax liabilities:
Deferred finance charges	(333)	(323)
Capital assets and other	(388)	(797)
Goodwill amortization	(102,722)	(91,724)
Total deferred tax liabilities	(103,443)	(92,844)
Disclosed as:
Deferred tax liabilities (assets), net	(61,650)	(63,096)
Deferred tax assets	41,793	29,748
Deferred Tax Liabilities, Net, Noncurrent	$ 103,443	$ 92,844