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Stockholders' Equity - LTIP (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2011 | Nov. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2013 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
2007 LTIP SARs and 2007 LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting portion one |  |  | 50.00% |  |  |  |  |  |  |
Vesting portion two |  | 50.00% |  |  |  |  |  |  |  |
Compensation expenses reversed |  |  |  |  |  |  |  | $ 2,400 |  |
LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation expenses reversed |  |  |  |  |  |  |  |  | $ 1,400 |
Award vesting period (in years) |  |  |  | 3 years | 3 years | 3 years |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 98.29
2013 LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Compensation expenses reversed |  |  |  |  |  |  |  |  |  | $ 700
2016 LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  | $ 50.05 |
Award requisite service period |  |  |  |  |  |  |  |  | 36 months |
LTIP NQSOs | 2018 Long-Term Incentive Plan NQSOs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock granted net of forfeitures |  |  |  |  |  |  | $ 4,719 |  |  |
LTIP NQSOs | Long Term Incentive Plan NQSOs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  |  |  | 3 years |  |
LTIP NQSOs | 2017 Long-Term Incentive Plan NQSOs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock granted net of forfeitures |  |  |  |  |  |  | $ 4,825 |  |  |
Vesting December 2015 | 2007 LTIP SARs and 2007 LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting rights percentage |  | 80.00% |  |  |  |  |  |  |  |
Vesting December 2016 | 2007 LTIP SARs and 2007 LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Award vesting rights percentage | 20.00% |  |  |  |  |  |  |  |  |
Maximum | LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  | 160,000
Financial performance achievement percentage |  |  |  | 200.00% |  |  |  |  |  |
Maximum | 2016 LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 308,000 |
Minimum | LTIP PSUs | Long Term Incentive Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Financial performance achievement percentage |  |  |  | 90.00% |  |  |  |  |  |

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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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