Organization and Significant Accounting Policies (Details 8) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of changes in accumulated other comprehensive income
Beginning balance accumulated other comprehensive income (loss)	$ 12,480,000	$ (770,000)	$ 949,000
Other comprehensive income (loss) before reclassifications, net of tax	10,253,000	13,250,000	(1,719,000)
Amounts reclassified from accumulated other comprehensive income	(1,653,000)
Net current period other comprehensive income (loss)	8,600,000	13,250,000	(1,719,000)
Ending balance accumulated other comprehensive income (loss)	21,080,000	12,480,000	(770,000)
Income tax expense included in other comprehensive income	$ 5,900,000	$ 9,100,000