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Equity Incentive Plans (Details 1) (Restricted Stock [Member], USD $)
6 Months Ended
Jun. 30, 2014
Restricted Stock [Member]
 
Summary of the activity of restricted stock  
Restricted stock outstanding shares, Beginning Balance 734,000
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Beginning Balance $ 26.87
Granted shares 308,000
Granted Wtd. Avg. Grant Date Fair Value $ 32.23
Vested shares (203,000)
Vested Wtd. Avg. Grant Date Fair Value $ 24.96
Forfeited/canceled shares (16,000)
Forfeited/canceled Wtd. Avg. Grant Date Fair Value $ 33.06
Restricted stock outstanding shares, Ending Balance 823,000
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Ending Balance $ 29.28