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Income (Loss) per Share - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Net income | $ 16,178 | $ 7,006 | $ 31,363 | $ 34,792
Undistributed income allocated to participating securities | 242 | 92 | 433 | 415
Net income attributable to common stockholders | 15,936 | 6,914 | 30,930 | 34,377
Plus: Net income effect of convertible securities | 0 | 0 | 0 | 0
Numerator for diluted income per common share | $ 15,936 | $ 6,914 | $ 30,930 | $ 34,377
Basic weighted-average common stock shares outstanding (in shares) | 45,684 | 45,541 | 45,659 | 45,505
Dilutive effects of common stock equivalents (in shares) | 39 | 23 | 41 | 31
Diluted weighted-average common stock shares outstanding (in shares) | 45,723 | 45,564 | 45,700 | 45,536
Basic income (loss) per share (USD per share) | $ 0.35 | $ 0.15 | $ 0.68 | $ 0.76
Diluted income (loss) per share (USD per share) | $ 0.35 | $ 0.15 | $ 0.68 | $ 0.75
5.00% Convertible Senior Notes due 2021 |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Debt instrument, interest rate | 5.00% |  | 5.00% |
Warrant |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average number of shares issuable under the common stock warrants (in shares) | 354 | 354 | 354 | 354
Restricted Stock Awards |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 7 | 98 | 27 | 101
Stock Option Awards |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 1,300 | 1,500 | 1,300 | 1,500
Convertible Debt Securities |  |  |  |
Earnings Per Share Reconciliation [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 6,400 | 6,400 | 6,400 | 6,400

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2646-109256 + Details
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