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Capital Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 09, 2016 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  | $ 5.50 |  |  |  | $ 5.15 | $ 11.43 |
Proceeds from Issuance of Common Stock | $ 109,700 | $ 60,200 | $ 10 | $ 152,657 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  | $ 5.75 |  |
Warranty Liability |  |  |  |  |  | $ 13,202 |  | $ 18,503
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  |  |  |  | 11,200,000 |  |
Fair Value Adjustment of Warrants |  |  | $ (5,301) | 2,106 | $ 0 |  |  |
Warrants Issuance Cost charged to Earnings |  |  |  | $ 900 |  |  |  |
Total number of new units issued |  |  | 0 | 33,810,000 | 0 |  |  |
Issuance Costs, Warrants |  |  |  | $ 6,500 |  |  |  |
underwriters option to purchase |  |  | 2,900,000 |  |  |  |  |
per share net of underwrtiter discount |  | $ 5.2525 | $ 4.9183 |  |  |  |  |
Common Stock, Shares, Issued | 22,300,000 | 11,500,000 |  |  |  | 118,515,797 |  | 117,521,493
Unitssubjecttounderwritersoption |  | 1,500,000 |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  | 250,000,000 |  | 150,000,000
Common stock, par value (in dollars per share) |  |  |  |  |  | $ 0.01 |  | $ 0.01
Preferred stock, shares authorized |  |  |  |  |  | 5,000,000 |  |
Preferred stock, par value |  |  |  |  |  | $ 0.01 |  |
Common Stock, Shares, Outstanding |  | 114,985,072 | 114,985,072 | 80,256,544 | 79,649,946 | 115,877,704 |  | 114,985,072
Treasury stock, shares held |  | 2,536,421 | 2,536,421 | 2,281,495 | 2,224,285 | 2,638,093 |  | 2,536,421
Preferred stock, shares issued |  |  |  |  |  | 0 |  |
Common Shares Outstanding and Treasury Shares Held Rollforward [Table] |  |  |  |  |  |  |  |
Common shares outstanding, beginning balance |  | 114,985,072 | 114,985,072 | 80,256,544 | 79,649,946 |  |  |
Exercise of common stock options, net |  |  | 0 | 636,937 | 67,808 |  |  |
Grants of restricted stock, net |  |  | 892,632 | 281,591 | 538,790 |  |  |
Common shares outstanding, ending balance |  |  | 115,877,704 | 114,985,072 | 80,256,544 |  |  |
Treasury stock, beginning balance |  | 2,536,421 | 2,536,421 | 2,281,495 | 2,224,285 |  |  |
Shares received upon exercise of common stock options |  |  | 0 | 13,854 | 36,818 |  |  |
Shares received upon vesting of restricted stock, net |  |  | 101,672 | 241,072 | 20,392 |  |  |
Treasury stock, ending balance |  |  | 2,638,093 | 2,536,421 | 2,281,495 |  |  |
Amount authorized under stock repurchase program |  |  |  |  |  | $ 20,000 |  |
Amount repurchased under the stock repurchase program in the period |  |  | 0 |  |  |  |  |

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