Stock-Based Compensation (Weighted-Average Assumptions Used in Estimating Grant Date Fair Values of Stock Option Awards) (Details) - $ / shares		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Key assumptions used in estimating the grant date fair values of stock option awards granted
Total stock options granted		274,000	259,000	714,000
Weighted-average grant date fair value		$ 5.31	$ 12.48	$ 17.69
Risk-Free Rate (as a percent)		1.20%	1.30%	1.80%
Expected life of options	[1]	4 years 2 months 12 days	4 years 8 months 12 days	5 years 8 months 12 days
Expected volatility (as a percent)	[2]	40.60%	45.50%	50.60%

[1] Calculated using the simplified method due to the terms of the stock options and the limited pool of grantees.

[2] Calculated using historical volatility of the Company's common stock over periods commensurate with the expected life of the option.