Other Comprehensive Income (Loss) (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net	$ 188,803	$ 82,043
Other comprehensive income (loss), Current period activity	(24,215)	119,652	(11,314)
Other Comprehensive Income (Loss), tax (expense) benefit	9,284	(12,892)
Accumulated other comprehensive income (loss), balance at end of period, net	173,872	188,803	82,043
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net	(5,033)	(9,139)
Other comprehensive income (loss), Current period activity	1,155	4,106
Accumulated other comprehensive income (loss), balance at end of period, net	(3,878)	(5,033)
Unrealized/Recognized Gains (Losses)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net	193,836	91,182
Other comprehensive income (loss), Current period activity	(25,370)	115,546
Other Comprehensive Income (Loss), tax (expense) benefit	(9,284)	(12,892)
Accumulated other comprehensive income (loss), balance at end of period, net	$ 177,750	$ 193,836