Stock-Based Compensation (Schedule of Awards Outstanding and Exercisable) (Details) - Stock Options and Stock Appreciation Rights (SARs) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise prices (dollars per share)	$ 6.64	$ 6.97
Grants outstanding (shares)	214
Grants exercisable (shares)	209
$10.21 to $10.88
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum (dollars per share)	$ 10.21
Range of exercise prices, maximum (dollars per share)	10.88
Weighted average exercise prices (dollars per share)	$ 10.63
Grants outstanding (shares)	46
Intrinsic value - grants outstanding	$ 0
Grants exercisable (shares)	41
Intrinsic value - grants exercisable	$ 0
$2.37 to $6.21
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum (dollars per share)	$ 2.37
Range of exercise prices, maximum (dollars per share)	6.21
Weighted average exercise prices (dollars per share)	$ 5.55
Grants outstanding (shares)	168
Intrinsic value - grants outstanding	$ 630
Grants exercisable (shares)	168
Intrinsic value - grants exercisable	$ 630