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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Activity (Narratives) (Details) - USD ($) shares in Thousands, $ in Millions | 9 Months Ended |
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Sep. 30, 2018 | Dec. 31, 2017
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) | 1,546 |
Restricted stock, restricted stock units, performance units, cash settled restricted stock units and cash settled performance units |  |
Stock-Based Compensation |  |
Non-vested awards at the end of the period (in shares) | 1,762 | 1,440
Unrecognized compensation |  |
Expected unrecognized compensation cost related to unvested awards (in dollars) | $ 13.2 |
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized | 2 years 3 months 18 days |
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 Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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