Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Income Statement [Abstract] | |||
| Depreciation | $ 9,835 | $ 11,429 | $ 11,965 |
| X | ||||||||||
- Definition The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|