Equity Incentive Plans - Restricted Stock Activity (Details) - Restricted Stock shares in Thousands	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Shares
Beginning balance (in shares) | shares	2,018
Granted (in shares) | shares	788
Vested (in shares) | shares	(701)
Forfeited/canceled (in shares) | shares	(53)
Ending balance (in shares) | shares	2,052
Wtd. Avg. Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 27.62
Granted (in dollars per share) | $ / shares	23.79
Vested (in dollars per share) | $ / shares	24.09
Forfeited/canceled (in dollars per share) | $ / shares	24.11
Ending balance (in dollars per share) | $ / shares	$ 27.32