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Stock-based Compensation - Nonvested Stock Awards (Details) - Jun. 30, 2015 - Nonvested Stock Awards and Performance Shares - $ / shares
Total
Total
Shares    
Beginning of period 953,608 746,567
Granted 19,322 410,192
Vested (1,641) (64,719)
Forfeited (7,059) (127,810)
End of period 964,230 964,230
Weighted Average Grant Date Fair Value    
Beginning of period $ 18.29 $ 15.76
Granted 17.85 19.01
Vested 18.27 15.96
Forfeited 18.97 7.09
End of period $ 18.28 $ 18.28