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Common Stock (Share-Based Compensation, Treasury Stock, and Stock Repurchase Plan) (Details) - USD ($) | 12 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2019 | Jun. 30, 2015 | Nov. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-cash share-based compensation expense | $ 7,100,000 | $ 10,600,000 | $ 11,400,000 |  |  |  |
Common stock shares purchased as payment of income tax withholding (in shares) | 93,977 | 199,644 | 238,216 |  |  |  |
Stock surrendered for exercise of stock options (in shares) | 0 | 478,287 | 3,225 |  |  |  |
Common stock shares purchased, cost |  |  | $ 5,203,000 |  |  |  |
Common stock shares purchased by the company (in shares) |  | 0 |  |  |  |  |
Remaining authorized repurchase amount | $ 49,700,000 |  |  |  | $ 49,700,000 |  |
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, cost | $ 25,000,000 |  | $ 5,200,000 |  |  |  |
Common stock shares purchased by the company (in shares) |  |  | 905,000 | 0 |  |  |
Common stock shares purchased, average cost per share (in dollars per share) |  |  | $ 5.75 |  |  |  |
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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