Equity Compensation (Options Activity) (Details)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period (in shares) | shares	1,441,202
Canceled (in shares) | shares	(23,032)
Options outstanding at end of period (in shares) | shares	1,418,170
Weighted Average Exercise Price
Options outstanding at beginning of period - Weighted Average Exercise Price (in dollars per share)	$ 18.26
Canceled - Weighted Average Exercise Price (in dollars per share)	19.95
Options outstanding at end of period - Weighted Average Exercise Price (in dollars per share)	$ 18.23
Options exercisable at end of period (in shares) | shares	1,415,170
Stock Options
Weighted Average Exercise Price
Options outstanding at end of period - Weighted Average Exercise Price (in dollars per share)	$ 18.23
Options available for grant at end of period (in shares) | shares	3,513,468	[1]
$12.15 – $20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, lower limit (in dollars per share)	$ 12.15
$12.15 – $20.00 | Stock Options
Weighted Average Exercise Price
Options outstanding at end of period - Weighted Average Exercise Price (in dollars per share)	12.74
$30.01 – $33.36
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price range, upper limit (in dollars per share)	33.36
$30.01 – $33.36 | Stock Options
Weighted Average Exercise Price
Options outstanding at end of period - Weighted Average Exercise Price (in dollars per share)	$ 33.36

[1]  * Shares available for grant under the 2018 Plan as of June 30, 2020 reduced by net restricted share and restricted share unit award activity of 696,358 shares and performance share and performance share unit award activity of 1,859,054 shares.