Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Capital assets and other	$ 5,059	$ 6,758
Net operating loss carry forwards	49,318	44,305
Interest deductions	2,026	12,146
Refinancing charge	5,578	7,413
Goodwill and intangibles	129,455	179,029
Stock compensation	1,208	2,581
Pension plan	4,165	5,095
Deferred Tax Assets, Unrealized Currency Losses	8,653	15,237
Capital loss carry forwards	11,450	10,957
Accounting reserves	412	7,138
Gross deferred tax asset	217,324	290,659
Less: valuation allowance	(19,032)	(248,866)
Net deferred tax assets	198,292	41,793
Deferred tax liabilities:
Deferred finance charges	0	(333)
Capital assets and other	0	(388)
Goodwill amortization	(89,727)	(109,638)
Total deferred tax liabilities	(89,727)	(110,359)
Disclosed as:
Deferred tax liabilities (assets), net	108,565	68,566
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	115,325	41,793
Net Deferred Tax Asset, Gross of Jurisdictional Netting		41,793
Deferred Tax Liabilities, Net, Noncurrent	$ 6,760	110,359
Deferred Tax Liability, Gross of Jurisdictional Netting		$ 110,359