Equity-Based Compensation (Summary of Ranges of Outstanding and Exercisable Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding	247,666	277,224	458,349	569,319
Weighted Average Remaining Contractual Life (in years)	5 years 3 months 7 days
Weighted Average Exercise Price	$ 16.02	$ 19.08	$ 15.13
Options Exercisable	197,666
$8.90 – $9.32
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 8.90
Exercise Price Range, Upper Range Limit	$ 9.32
Options Outstanding	28,750
Weighted Average Remaining Contractual Life (in years)	2 years 8 months 12 days
Weighted Average Exercise Price	$ 8.90
Options Exercisable	28,750
Weighted Average Exercise Price	$ 8.90
$9.33 – $11.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	9.33
Exercise Price Range, Upper Range Limit	$ 11.73
Options Outstanding	92,441
Weighted Average Remaining Contractual Life (in years)	3 years 8 months 12 days
Weighted Average Exercise Price	$ 9.74
Options Exercisable	92,441
Weighted Average Exercise Price	$ 9.74
$11.74 – $17.94
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	11.74
Exercise Price Range, Upper Range Limit	$ 17.94
Options Outstanding	39,475
Weighted Average Remaining Contractual Life (in years)	1 year 8 months 12 days
Weighted Average Exercise Price	$ 13.72
Options Exercisable	39,475
Weighted Average Exercise Price	$ 13.72
$17.95 – $23.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	17.95
Exercise Price Range, Upper Range Limit	$ 23.80
Options Outstanding	37,000
Weighted Average Remaining Contractual Life (in years)	8 months 9 days
Weighted Average Exercise Price	$ 22.16
Options Exercisable	37,000
Weighted Average Exercise Price	$ 22.16
$23.81 – $43.05
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	23.81
Exercise Price Range, Upper Range Limit	$ 43.05
Options Outstanding	50,000
Weighted Average Remaining Contractual Life (in years)	8 years 6 months 26 days
Weighted Average Exercise Price	$ 33.90
Options Exercisable	0
Weighted Average Exercise Price	$ 0