Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Excess tax benefit (expense) from stock-based compensation | $ 0 | $ (1,045) | |
| Shares surrendered in lieu of tax | $ 936 | $ 1,156 | 1,033 |
| Accounting Standards Update 2016-09 | |||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||
| Excess tax benefit (expense) from stock-based compensation | 0 | ||
| Shares surrendered in lieu of tax | $ (1,200) | $ (1,000) | |
| X | ||||||||||
- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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