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Stock-based Compensation Stock Awards Activity (Details) - $ / shares
shares in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Stock-based Compensation Stock Awards Activity Details    
Balance at beginning of period 4,950 4,545
Granted 370 301
Vested (189) (312)
Canceled and forfeited (128) (101)
Balance at end of period 5,003 4,433
Weighted-average grant date fair market value of restricted stock rights granted $ 13.50 $ 11.53
Weighted-average remaining contractual term, in years, ending balance 2 years 162 days 2 years 176 days