Shareholders' Equity, Stock Plans and Preferred Stock - Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable (Details) - Stock Options and Stock Appreciation Rights (SARs) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	122	122	211
Granted (in shares)	30
Exercised (in shares)	(100)
Expired or cancelled (in shares)	(19)
Outstanding at end of period (in shares)	122
Number of Shares, Exercisable (in shares)		102
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Outstanding at beginning of period (in dollars per share)	$ 6.64
Weighted-Average Exercise Price, Granted (in dollars per share)	8.14
Weighted-Average Exercise Price, Exercised (in dollars per share)	5.79
Weighted-Average Exercise Price, Expired or cancelled (in dollars per share)	9.17
Weighted-Average Exercise Price, Outstanding at end of period (in dollars per share)	$ 7.29
Weighted-Average Exercise Price, Exercisable (in dollars per share)		$ 7.13