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Basis of Presentation and Summary of Significant Accounting Policies Correction of Immaterial Error (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Liabilities | $ 709,335 | $ 723,877 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (175,734) | $ (197,656) | $ (155,339) | $ (179,875)
Out-of-period Immaterial Adjustment [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (Decrease) in Deferred Income Taxes | 2,255 |  |  |
Liabilities | 2,255 |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ (2,255) |  |  | (2,255)
Increase in Deferred tax liability | 5.60% | 7.80% |  |
Increase in Total liabilities | 0.30% | 0.30% |  |
Decrease in Retained earnings | 9.80% | 3.70% |  |
Decrease in Total stockholders' equity | 1.30% | 1.10% |  |
Accumulated Deficit |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ (20,711) | $ (57,904) | $ (1,130) | $ 17,468
Accumulated Deficit | Out-of-period Immaterial Adjustment [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ (2,255) |  |  |

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