Stock-Based Compensation (Stock Options) (Details) - Stock options - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Shares Under Option
Outstanding at beginning of period (in shares)	55,000
Exercised (in shares)	0	0	0
Forfeited/Expired (in shares)	(12,500)
Outstanding at end of period (in shares)	42,500.0	55,000
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 31.75
Forfeited/Expired (in dollars per share)	31.75
Outstanding at end of period (in dollars per share)	$ 31.75	$ 31.75
Aggregate Intrinsic Value
Outstanding at beginning of period	$ 0
Outstanding at end of period	0	$ 0
Recognized stock-based compensation expense	0	0	$ 0
Unrecognized stock-based compensation expense		0
Proceeds from stock options exercised	$ 0	$ 0	$ 0
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	7 years