Shareholders' Equity, Stock Plans and Preferred Stock (Restricted Stock and Restricted Stock Units Activity) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares) | shares	141
Granted (in shares) | shares	83
Dividend Equivalents (in shares) | shares	4
Vested (in shares) | shares	(68)
Cancelled (in shares) | shares	(7)
Outstanding at beginning of period (in shares) | shares	153
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Outstanding at beginning of period (in dollars per share) | $ / shares	$ 9.07
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	8.87
Weighted Average Grant Date Fair Value, Dividend Equivalents (in dollars per share) | $ / shares	9.21
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	7.85
Weighted-Average Grant Date Fair Value, Cancelled (in dollars per share) | $ / shares	9.80
Weighted-Average Grant Date Fair Value, Outstanding at end of period (in dollars per share) | $ / shares	$ 9.47
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares) | shares	62
Granted (in shares) | shares	17
Dividend Equivalents (in shares) | shares	2
Vested (in shares) | shares	(27)
Cancelled (in shares) | shares	0
Outstanding at beginning of period (in shares) | shares	54
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Outstanding at beginning of period (in dollars per share) | $ / shares	$ 9.58
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	8.87
Weighted Average Grant Date Fair Value, Dividend Equivalents (in dollars per share) | $ / shares	9.19
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	6.13
Weighted-Average Grant Date Fair Value, Cancelled (in dollars per share) | $ / shares	0.00
Weighted-Average Grant Date Fair Value, Outstanding at end of period (in dollars per share) | $ / shares	$ 11.10