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Equity Incentive Program Equity Incentive Program - PSUs (Details) - Performance Shares
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Number of Shares [Roll Forward]  
Beginning balance | shares 176,000
Granted | shares 365,456
Vested | shares 0
Forfeited | shares 0
Ending balance | shares 541,456
Weighted Average Grant Date Fair Value  
Beginning balance | $ / shares $ 15.32
Granted | $ / shares 13.75
Vested | $ / shares 0.00
Forfeited | $ / shares 0.00
Ending balance | $ / shares $ 14.26