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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]    
NET INCOME $ 5,416 $ 9,065
Other comprehensive income:    
Unrealized gains on investments 60 61
Income tax expense related to unrealized gains on investments 23 24
Other comprehensive income, net of tax 37 37
COMPREHENSIVE INCOME $ 5,453 $ 9,102