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Income Taxes - Textual (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax [Line Items]          
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit)     $ (26,674)    
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)     (100,472) $ 0 $ 0
Deferred Other Tax Expense (Benefit)     $ 66,373    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     26.50% 26.50% 26.50%
Deferred Tax Benefit (Expense), Valuation Allowance Remeasurement     $ 60,772    
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount     (220) $ 1,848 $ 163
Non-deductible stock-based compensation     1,441 1,123 665
Change to valuation allowance     (103,212) 6,605 3,565
Impact of tax reform     4,463 (4,579) $ 1,906
Income taxes receivable $ 4,582 $ 1,506 4,582 1,506  
Taxes payable 3,810 4,547 3,810 4,547  
Deferred Tax Assets, Valuation Allowance 19,032 248,866 $ 19,032 248,866  
Operating loss carryforwards expiration period     2017 through 2032    
Indefinite loss carryforwards 96,063   $ 96,063    
Valuation allowance, deferred tax asset, increase (decrease), amount (226,466) 925 232,632    
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset Valuation Allowance, Income Tax Increase (Decrease)     (127,146)    
Unrecognized tax benefits 1,556 2 1,556 2  
Unrecognized tax benefits, income tax penalties and interest accrued 0 78 0 78  
United States Federal [Member]          
Income Tax [Line Items]          
Operating loss carryforwards 29,723   29,723    
United States          
Income Tax [Line Items]          
Indefinite loss carryforwards 9,646   9,646    
Foreign Tax Authority          
Income Tax [Line Items]          
Operating loss carryforwards 116,536   116,536    
Canada          
Income Tax [Line Items]          
Indefinite loss carryforwards   $ 86,417   $ 86,417  
State and Local Jurisdiction [Member]          
Income Tax [Line Items]          
Operating loss carryforwards $ 119,188   119,188    
Utilization of deferred tax asset [Member]          
Income Tax [Line Items]          
Valuation allowance, deferred tax asset, increase (decrease), amount     $ 105,486