Equity Compensation (Stock Options Outstanding by Exercise Price) (Details) - $ / shares	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 16.12	$ 18.26
$12.15 – $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	12.15
$12.15 – $20.00 | Minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	12.15
$12.15 – $20.00 | Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	20.00
$20.01 – $25.00 | Minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	20.01
$20.01 – $25.00 | Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	25.00
$25.01 – $30.00 | Minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	25.01
$25.01 – $30.00 | Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower limit (in dollars per share)	30.00
$30.01 – $33.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	33.36
$30.01 – $33.36 | Minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	30.01
$30.01 – $33.36 | Maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, upper limit (in dollars per share)	$ 33.36
Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding at end of period (in shares)	1,087,196
Options Outstanding - Weighted Average Remaining Contractual Life	3 years 10 months 24 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 16.12
Options Exercisable - Number Exercisable At end of period (in shares)	1,087,196
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 16.12
Stock Options | $12.15 – $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding at end of period (in shares)	777,159
Options Outstanding - Weighted Average Remaining Contractual Life	5 years 1 month 6 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 12.74
Options Exercisable - Number Exercisable At end of period (in shares)	777,159
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 12.73
Stock Options | $20.01 – $25.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding at end of period (in shares)	300,149
Options Outstanding - Weighted Average Remaining Contractual Life	10 months 24 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 24.45
Options Exercisable - Number Exercisable At end of period (in shares)	300,149
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 24.45
Stock Options | $25.01 – $30.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding at end of period (in shares)	5,392
Options Outstanding - Weighted Average Remaining Contractual Life	2 months 12 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 27.82
Options Exercisable - Number Exercisable At end of period (in shares)	5,392
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 27.82
Stock Options | $30.01 – $33.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding at end of period (in shares)	4,496
Options Outstanding - Weighted Average Remaining Contractual Life	7 months 6 days
Options Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 33.36
Options Exercisable - Number Exercisable At end of period (in shares)	4,496
Options Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 33.36