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Equity Incentive Plans - Restricted Stock Activity (Details) - Restricted Stock
shares in Thousands
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Shares  
Restricted stock outstanding shares, Beginning Balance | shares 2,018
Granted shares | shares 778
Vested shares | shares (697)
Forfeited/canceled shares | shares (6)
Restricted stock outstanding shares, Ending Balance | shares 2,093
Wtd. Avg. Grant Date Fair Value  
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares $ 27.62
Granted Wtd. Avg. Grant Date Fair Value (in dollars per share) | $ / shares 23.79
Vested Wtd. Avg. Grant Date Fair Value (in dollars per share) | $ / shares 24.08
Forfeited/canceled Wtd. Avg. Grant Date Fair Value (in dollars per share) | $ / shares 24.89
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 27.26