Deferred Acquistion Costs Components of deferred acquisition (Details) - USD ($) $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Mar. 31, 2014 |
Dec. 31, 2013 |
|
| Deferred Acquisition Costs [Line Items] | ||||
| Balance at January 1, net | $ 12,143 | $ 12,197 | $ 1,043 | $ 12,392 |
| Additions | 26,307 | 26,627 | ||
| Amortization | 26,361 | 25,779 | ||
| Balance at December 31, net | $ 12,143 | $ 12,197 | ||