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Equity Compensation Plans - Unrecognized Compensation Cost (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period | $ 18,146 |
Equity grants | 6,088 |
Equity grant forfeitures | (122) |
Equity compensation expense | (2,176) |
Unrecognized Compensation Cost at End of Period | 21,936 |
Deferred Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity compensation expense |  | $ (3,000)
Incentive Plans | Restricted Stock |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period | 2,091 |
Equity grants | 2,234 |
Equity grant forfeitures | (122) |
Equity compensation expense | (267) |
Unrecognized Compensation Cost at End of Period | 3,936 |
Incentive Plans | Deferred Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period | 11,506 |
Equity grants | 3,725 |
Equity grant forfeitures | 0 |
Equity compensation expense | (1,298) |
Unrecognized Compensation Cost at End of Period | 13,933 |
Incentive Plans | Performance Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period | 4,549 |
Equity grants | 0 |
Equity grant forfeitures | 0 |
Equity compensation expense | (579) |
Unrecognized Compensation Cost at End of Period | 3,970 |
Employee Stock Purchase Plan |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period | 0 |
Equity grants | 129 |
Equity grant forfeitures | 0 |
Equity compensation expense | (32) |
Unrecognized Compensation Cost at End of Period | $ 97 |

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- Definition Represents the amount of equity grant forfeitures during the period. + References No definition available. + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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