Income Taxes - Textual (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit)				$ 26,674,000
Income tax expense (benefit)			$ 31,603,000	(168,064,000)	$ (9,404,000)
Income (loss) before income taxes, equity in non-consolidated affiliates and noncontrolling interest			(80,407,000)	87,078,000	(49,716,000)
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)			$ 0	$ 100,472,000	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount			$ 10,091,000	$ (220,000)	$ 1,848,000
Non-deductible stock-based compensation			1,512,000	1,441,000	1,123,000
Change to valuation allowance			49,482,000	(103,212,000)	6,605,000
Impact of tax reform			(152,000)	(2,939,000)	(353,000)
Income taxes receivable	$ 4,388,000	$ 4,582,000	4,388,000	4,582,000
Taxes payable	10,045,000	3,810,000	10,045,000	3,810,000
Deferred Tax Assets, Valuation Allowance	68,479,000	19,032,000	68,479,000	$ 19,032,000
Operating loss carryforwards expiration period				2017 through 2032
Indefinite loss carryforwards	122,830,000		122,830,000
Valuation allowance, deferred tax asset, increase (decrease), amount	(49,447,000)	(226,466,000)
Unrecognized tax benefits	973,000	1,556,000	973,000	$ 1,556,000
Unrecognized tax benefits, income tax penalties and interest accrued	87,000	$ 123,000	87,000	123,000
United States Federal [Member]
Income Tax [Line Items]
Operating loss carryforwards	68,325,000		68,325,000
United States
Income Tax [Line Items]
Indefinite loss carryforwards	33,572,000		33,572,000
Foreign Tax Authority
Income Tax [Line Items]
Income (loss) before income taxes, equity in non-consolidated affiliates and noncontrolling interest			(11,709,000)	$ 39,025,000	$ (33,055,000)
Operating loss carryforwards	153,021,000		153,021,000
Canada
Income Tax [Line Items]
Indefinite loss carryforwards	89,258,000		89,258,000
State and Local Jurisdiction [Member]
Income Tax [Line Items]
Operating loss carryforwards	118,575,000		118,575,000
Canada Revenue Agency [Member]
Income Tax [Line Items]
Change to valuation allowance			49,447,000
Valuation allowance, deferred tax asset, increase (decrease), amount			(49,447,000)
Minimum
Income Tax [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	400,000		400,000
Maximum
Income Tax [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 500,000		$ 500,000