Other Comprehensive Income (Loss) (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net		$ 188,803
Other comprehensive income (loss) before reclassifications		78,789
Amounts reclassified from accumulated other comprehensive income (loss)		(54,565)
Other Comprehensive Income (Loss), tax (expense) benefit	3,647	(7,946)
Accumulated other comprehensive income (loss), balance at end of period, net	205,081	205,081
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net		(5,033)
Other comprehensive income (loss) before reclassifications		1,029
Accumulated other comprehensive income (loss), balance at end of period, net	(4,004)	(4,004)
Unrealized/Recognized Gains (Losses)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), balance at beginning of period, net		193,836
Other comprehensive income (loss) before reclassifications		77,760
Amounts reclassified from accumulated other comprehensive income (loss)		(54,565)
Other Comprehensive Income (Loss), tax (expense) benefit		(7,946)
Accumulated other comprehensive income (loss), balance at end of period, net	$ 209,085	$ 209,085