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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity - Narratives (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Performance-based restricted stock units |  |  |
Stock-Based Compensation |  |  |
Performance period | 2 years 9 months 28 days |  |
Risk free rate (percent) | 2.36% |  |
Dividend yield ( percent) | 0.00% |  |
Expected grant date fair value (usd per share) | $ 13.46 |  |
Cash settled restricted stock units and cash settled performance units |  |  |
Stock-Based Compensation |  |  |
Non-vested awards at the end of the period (in shares) | 216 |  |
Restricted stock shares, restricted stock units and performance units |  |  |
Stock-Based Compensation |  |  |
Non-vested awards at the end of the period (in shares) | 1,512 |  |
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units |  |  |
Stock-Based Compensation |  |  |
Fair value of vested shares | $ 8.2 | $ 10.8 | $ 6.0
Non-vested awards at the end of the period (in shares) | 1,728 | 1,440 |
Unrecognized compensation |  |  |
Expected unrecognized compensation cost related to unvested awards (in dollars) | $ 10.7 |  |
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized | 2 years 2 months 12 days |  |
Payments for vested shares | $ 1.1 | $ 1.8 | $ 0.6
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | First anniversary vesting |  |  |
Stock-Based Compensation |  |  |
Vesting percentage | 33.33% |  |
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | Second anniversary vesting |  |  |
Stock-Based Compensation |  |  |
Vesting percentage | 33.33% |  |
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units | Third anniversary vesting |  |  |
Stock-Based Compensation |  |  |
Vesting percentage | 33.33% |  |
Vesting period | 3 years |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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