Condensed Consolidated Statements of Comprehensive Operations (Unaudited) (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other comprehensive income (loss), net of income tax:
Tax effect of changes in value on available-for-sale securities	$ 0	$ (4,375,000)	$ 0	$ (1,824,000)
Tax for interest rate lock derivative contracts reclassified to income	$ 10,000	$ 10,000	$ 21,000	$ 21,000