Other Comprehensive Income (Loss) - Accumulated other comprehensive income (loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated other comprehensive income (loss), net of tax
Accumulated other comprehensive income (loss), balance at beginning of period, net	$ 61,981
Accumulated other comprehensive income (loss), balance at end of period, net	19,607
Unrealized/Recognized Gains (Losses)
Accumulated other comprehensive income (loss), net of tax
Accumulated other comprehensive income (loss), balance at beginning of period, net	61,981
Other comprehensive income (loss) before reclassifications	(1,638)
Amounts reclassified from accumulated other comprehensive income (loss)	(40,736)
Accumulated other comprehensive income (loss), balance at end of period, net	$ 19,607