Related Party Transactions (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Parent and its affiliates | |||
| Related Party Transactions | |||
| Net fees paid for services provided by the related parties | $ 4,826 | $ 6,497 | $ 7,232 |