|
Goodwill - Additional Information (Details) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Goodwill and Intangible Assets Disclosure [Abstract] | |||
| Goodwill | $ 216,930,000 | $ 222,460,000 | $ 222,460,000 |
| Goodwill adjustment | 5,530,000 | ||
| Goodwill, impairment | 0 | 0 | |
| Goodwill, acquired | $ 0 | $ 0 | |