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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]      
Other comprehensive income (loss), taxes $ 0us-gaap_OtherComprehensiveIncomeLossTax $ 0us-gaap_OtherComprehensiveIncomeLossTax $ 0us-gaap_OtherComprehensiveIncomeLossTax