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Income Taxes - Textual (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | $ 1,848,000 | $ 163,000 | $ 3,075,000
Non-deductible stock-based compensation | 1,123,000 | 665,000 | 1,982,000
Change to valuation allowance on items affecting taxable income | 6,605,000 | 3,565,000 | (643,000)
Effect of the difference in federal and statutory rates | (4,579,000) | 1,906,000 | 2,222,000
Income taxes receivable | 1,506,000 | 615,000 |
Taxes payable | $ 4,547,000 | 7,019,000 |
Operating loss carryforwards expiration period | 2016 through 2031 |  |
Indefinite loss carryforwards | $ 118,413,000 |  |
Valuation allowance, deferred tax asset, increase (decrease), amount | 6,605,000 | 3,565,000 | (643,000)
Pension and other postretirement benefit plans, tax | 0 | 0 | $ 1,112,000
Unrecognized tax benefits | 1,543,000 | 4,000 |
Unrecognized tax benefits, income tax penalties and interest accrued | 0 | $ 595,000 |
United States Federal [Member] |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 21,339,000 |  |
United States |  |  |
Income Tax [Line Items] |  |  |
Indefinite loss carryforwards | 35,723,000 |  |
Foreign Tax Authority |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 70,517,000 |  |
Canada |  |  |
Income Tax [Line Items] |  |  |
Indefinite loss carryforwards | 82,691,000 |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax [Line Items] |  |  |
Operating loss carryforwards | 188,367,000 |  |
Canada Revenue Agency [Member] |  |  |
Income Tax [Line Items] |  |  |
Effect of the difference in federal and statutory rates | $ (4,579,000) |  |

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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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