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Common Stock (Share-Based Compensation, Treasury Stock, and Stock Repurchase Plan) (Details) - USD ($) | 12 Months Ended | 31 Months Ended | 62 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2015 | Nov. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-cash share-based compensation expense | $ 11,200,000 | $ 12,100,000 | $ 13,100,000 |  |  |  |
Common stock shares purchased as payment of income tax withholding (in shares) | 199,644 | 238,216 | 473,304 |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 478,287 | 3,225 | 106,810 |  |  |  |
Common stock shares purchased, cost | $ 5,203,000 |  | $ 9,697,000 |  |  |  |
Remaining authorized repurchase amount | 49,700,000 |  |  | $ 49,700,000 | $ 49,700,000 |  |
Restated Revolving Credit, Term Loan and Security Agreement |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share repurchase covenant | $ 9,700,000 |  |  |  |  |  |
Share Repurchase Program, November 2012 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock repurchase shares authorized |  |  |  |  |  |  | $ 25,000,000
Common stock shares purchased by the company (in shares) | 905,000 | 0 | 799,723 |  |  |  |
Common stock shares purchased, cost | $ 5,200,000 |  | $ 9,700,000 |  | $ 25,000,000 |  |
Common stock shares purchased, average cost per share (in dollars per share) | $ 5.75 |  | $ 12.13 |  |  |  |
Share Repurchase Program, June 2015 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock repurchase shares authorized |  |  |  |  |  | $ 50,000,000 |
Common stock shares purchased, cost |  |  |  | $ 300,000 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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