Goodwill And Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Goodwill [Roll Forward] | ||||||
| Goodwill, Gross | $ 189,943 | $ 161,001 | $ 161,075 | |||
| Accumulated impairment losses | (73,111) | (73,111) | (73,111) | |||
| Goodwill, Net, Beginning Balance | $ 116,832 | $ 87,890 | $ 87,964 | $ 116,832 | $ 87,890 | $ 87,964 |
| Goodwill acquired during the year | 29,029 | |||||
| Effects of foreign currency exchange | (87) | (74) | ||||
| Goodwill, Net, Ending Balance | 116,832 | 87,890 | 87,964 | |||
| Impairment of goodwill | $ 0 | $ 0 | $ 0 | |||