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Stock-Based Compensation (Restricted Stock) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 277,307 |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |
Nonvested at the beginning of the period (in shares) | 494,882 |  | 494,882 |  |  |  |  |
Granted (in shares) |  |  | 277,307 |  |  |  |  |
Forfeited (in shares) |  |  | (70,391) |  |  |  |  |
Nonvested at the end of the period (in shares) |  |  | 465,584 | 494,882 |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |
Excess tax benefits from stock-based compensation |  | $ 0 |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 285,075 |  |  |  |  |
Granted (in dollars per share) |  |  | $ 22.40 |  |  |  |  |
Recognized stock-based compensation expense |  |  | $ 4,470,000 | $ 4,174,000 | $ 3,925,000 |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |
Nonvested at the beginning of the period (in shares) | 583,380 |  | 583,380 |  |  |  |  |
Granted (in shares) |  |  | 285,075 |  |  |  |  |
Vested (in shares) |  |  | (348,572) |  |  |  |  |
Forfeited (in shares) |  |  | (53,274) |  |  |  |  |
Nonvested at the end of the period (in shares) |  |  | 466,609 | 583,380 |  |  |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 15.08 |  | $ 15.08 |  |  |  |  |
Granted (in dollars per share) |  |  | 22.40 |  |  |  |  |
Vested (in dollars per share) |  |  | 13.38 |  |  |  |  |
Forfeited (in dollars per share) |  |  | 20.01 |  |  |  |  |
Nonvested at the end of the period (in dollars per share) |  |  | $ 20.26 | $ 15.08 |  |  |  |
Additional disclosures |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense |  |  | $ 5,400,000 |  |  |  |  |
Unrecognized stock-based compensation expense, period of recognition |  |  | 1 year 10 months 24 days |  |  |  |  |
2013 Equity and Incentive Compensation Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum number of shares authorized for issuance |  |  | 7,800,000 |  |  |  |  |
Number of shares available for grant |  |  | 2,600,000 |  |  |  |  |
2013 Equity and Incentive Compensation Plan | Equity Awards, Other Than Options And Stock Appreciation Rights [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  | 4,600,000 |  |  |  |  |
Number of shares available for grant |  |  | 1,500,000 |  |  |  |  |
1995 Non-Employee Directors' Stock Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum number of shares authorized for issuance |  |  | 400,000 |  |  |  |  |
Number of shares available for grant |  |  | 158,000 |  |  |  |  |
1995 Non-Employee Directors' Stock Plan | Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) | 3 years |  |  |  |  |  |  |
Granted (in shares) |  |  | 14,211 | 43,821 | 56,203 | 109,998 |  |
Granted (in dollars per share) |  |  | $ 25.33 | $ 20.54 | $ 13.70 | $ 7.00 |  |
Restricted stock unit activity |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 14,211 | 43,821 | 56,203 | 109,998 |  |
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 25.33 | $ 20.54 | $ 13.70 | $ 7.00 |  |
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2016 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | $ 0 | $ 0 | $ 257,000 |  |  |
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2017 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | 0 | 179,000 | 641,000 |  |  |
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | 280,000 | 511,000 | 0 |  |  |
1995 Non-Employee Directors' Stock Plan | Restricted stock units | Issue Period Eight [Domain] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | $ 240,000 | $ 0 | $ 0 |  |  |
1995 Executive Incentive Compensation Plan | Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 270,864 | 242,791 | 286,251 | 536,773 | 239,679 | 190,832
Granted (in dollars per share) |  |  | $ 22.25 | $ 19.93 | $ 13.70 | $ 7.09 | $ 16.53 | $ 25.21
Restricted stock unit activity |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 270,864 | 242,791 | 286,251 | 536,773 | 239,679 | 190,832
Weighted Average Grant-Date Fair Value |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 22.25 | $ 19.93 | $ 13.70 | $ 7.09 | $ 16.53 | $ 25.21
1995 Executive Incentive Compensation Plan | Restricted stock units | 2014 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | $ 0 | $ 0 | $ 295,000 |  |  |
1995 Executive Incentive Compensation Plan | Restricted stock units | 2015 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | 0 | 193,000 | 498,000 |  |  |
1995 Executive Incentive Compensation Plan | Restricted stock units | 2016 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | 290,000 | 835,000 | 909,000 |  |  |
1995 Executive Incentive Compensation Plan | Restricted stock units | 2017 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | 832,000 | 910,000 | 1,325,000 |  |  |
1995 Executive Incentive Compensation Plan | Restricted stock units | 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | 1,208,000 | 1,546,000 | 0 |  |  |
1995 Executive Incentive Compensation Plan | Restricted stock units | Issue Period Eight [Domain] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  | $ 1,620,000 | $ 0 | $ 0 |  |  |

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