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Stock-based Compensation Restricted Stock Unit Activity (Details)
 3 Months Ended
Jun. 30, 2015
$ / shares
shares
Mar. 31, 2015
Stock-based Compensation Restricted Stock Unit Activity Details    
Balance at beginning of period 2,698,686  
Granted 543,147  
Vested (39,921)  
Forfeited (35,462)  
Balance at end of period 3,166,450  
RSU weighted-average remaining contractual term, in years 1.77 1.88
Beginning of period, weighted-average purchase price | $ / shares $ 7.33  
Granted, weighted-average purchase price | $ / shares 8.85  
Vested, weighted-average purchase price | $ / shares 7.86  
Forfeited, weighted-average purchase price | $ / shares 8.63  
End of period, weighted-average purchase price | $ / shares $ 7.57