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Stock-Based Compensation Plans and Employee Benefits (Stock-Based Compensation) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) point shares | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) point $ / shares shares | Jun. 30, 2017 USD ($) point shares | Dec. 31, 2017 USD ($) point shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ | $ 3,503 | $ 3,915 | $ 12,593 | $ 9,796 |
Number of Points Outstanding [Roll Forward] |  |  |  |  |
Accrued expenses | $ | $ 87,734 |  | $ 87,734 |  | $ 101,035
Long-term Incentive Plan 2009 |  |  |  |  |
Number of Points Outstanding [Roll Forward] |  |  |  |  |
Shares available for issuance | shares | 2,700,000 |  | 2,700,000 |  |
2013-2014 Performance Incentive Plan |  |  |  |  |
Number of Points Outstanding [Roll Forward] |  |  |  |  |
Points at beginning of period |  |  | 86.57 | 92.00 | 92.00
Granted (points) |  |  | 0.50 |  | 5.00
Forfeited (points) |  |  | (0.15) |  | (10.43)
Points at end of period | 86.92 |  | 86.92 |  | 86.57
Preferred return hurdle |  |  |  |  | 9.00%
Compensation value of total distribution | $ |  |  | $ 13,600 |  |
Cash portion of points distribution | $ |  |  | $ 6,800 |  |
Number of shares issued in points distribution | shares |  |  | 595,869 |  |
Value of shares issued in points distribution | $ |  |  | $ 6,800 |  |
Fair value of shares in points distribution | $ / shares |  |  | $ 11.41 |  |
Number of shares issued, net of tax withholding in points distribution | shares |  |  | 328,074 |  |
2015-2016 Performance Plan |  |  |  |  |
Number of Points Outstanding [Roll Forward] |  |  |  |  |
Points at beginning of period |  |  | 84.16 | 74.10 | 74.10
Granted (points) |  |  | 0.00 |  | 17.88
Forfeited (points) |  |  | (0.89) |  | (7.82)
Points at end of period | 83.27 |  | 83.27 |  | 84.16
2017-2018 Performance Incentive Plan |  |  |  |  |
Number of Points Outstanding [Roll Forward] |  |  |  |  |
Points at beginning of period |  |  | 40.97 | 0.00 | 0.00
Granted (points) |  |  | 49.08 |  | 41.68
Forfeited (points) |  |  | (4.56) |  | (0.71)
Points at end of period | 85.49 |  | 85.49 |  | 40.97
All Performance Incentive Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ | $ 2,200 | $ 2,900 | $ 10,200 | $ 7,900 |
Number of Points Outstanding [Roll Forward] |  |  |  |  |
Accrued expenses | $ | $ 34,300 |  | $ 34,300 |  | $ 38,100
Common Stock Subject to Sales Restriction | Employees |  |  |  |  |
Number of Points Outstanding [Roll Forward] |  |  |  |  |
Vested, number of shares | shares |  |  | 213,609 |  |
Restricted shares awarded | shares |  |  | 135,503 |  |
Sale restriction period |  |  | 18 months |  |
Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Non-vested at beginning of period (in shares) | shares |  |  | 282,000 | 290,000 | 290,000
Granted | shares |  |  | 264,000 |  | 116,000
Vested | shares |  |  | (40,000) |  | (75,000)
Forfeited | shares |  |  | (49,000) |  | (49,000)
Non-vested at end of period (in shares) | shares | 457,000 |  | 457,000 |  | 282,000
Unrecognized compensation cost | $ | $ 2,900 |  | $ 2,900 |  |
Weighted-average period to recognize the unrecognized compensation cost |  |  | 1 year 11 months 27 days |  |

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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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