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Equity Incentive Plans (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Summary of the activity of stock option awards    
Options outstanding, Beginning Balance, Shares 1,198  
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price $ 18.92  
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term 6 years 9 months 6 years 10 months 6 days
Options outstanding, Beginning Balance, Aggregate Intrinsic Value $ 11,090  
Options granted, Shares 0  
Options granted, Wtd. Avg. Exercise Price $ 0.00  
Options exercised, Shares (234)  
Options exercised, Wtd. Avg. Exercise Price $ 17.43  
Options forfeited/canceled/expired, Shares (5)  
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price $ 21.34  
Options outstanding, Ending Balance, Shares 959 1,198
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price $ 19.28 $ 18.92
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term 6 years 9 months 6 years 10 months 6 days
Options outstanding, Ending Balance, Aggregate Intrinsic Value 14,074 11,090
Options vested and expected to vest at June 30, 2013, Shares 929  
Options vested and expected to vest at June 30, 2013, Wtd. Avg. Exercise Price $ 19.21  
Options vested and expected to vest at June 30, Wtd. Avg., Remaining Contractual Term 6 years 8 months 16 days  
Options vested and expected to vest at June 30, 2013, Aggregate Intrinsic Value 13,701  
Options exercisable at June 30, 2013 Shares 594  
Options exercisable at June 30, 2013, Wtd. Avg. Exercise Price $ 18.23  
Options exercisable at June 30, 2013, Wtd. Avg. Remaining Contractual Term 6 years 1 month 17 days  
Options exercisable at June 30, 2013, Aggregate Intrinsic Value $ 9,346