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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements of Changes in Shareholders' Equity      
Stock option activity, tax benefit $ 9,725 $ 5,411 $ 1,369
Restricted stock activity, tax benefit 1,046 670 1,188
Change in fair value of interest rate swap contracts, income taxes     5,238
Cumulative-effect of adoption of amendments to ASC 924 regarding jackpot liabilities, income taxes     $ 1,068