Share-Based Compensation and Employee Ownership Plans Stock Options (Details) $ / shares in Units, $ in Thousands			12 Months Ended
		Dec. 05, 2016	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio		0.25
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%
Weighted Average Exercise Price/Share
Weighted average remaining term, options outstanding					1 year 7 months 6 days
Weighted average remaining term, options exercisable				1 year 1 month 6 days
Aggregate Intrinsic Value
Closing stock price, in dollars per share			$ 15.50	$ 15.32
Equity Plans
Shares Subject to Option
Balance outstanding, beginning of period, shares | shares	[1]		4,167	54,168
Options granted, shares | shares	[1]		0	0
Stock Options exercised, shares | shares	[1]		0	(25,000)
Options expired, shares | shares	[1]		0	(25,001)
Balance outstanding, end of period, shares | shares	[1]		4,167	4,167	54,168
Options exercisable, shares | shares	[1]		4,167	4,167
Weighted Average Exercise Price/Share
Balance outstanding, beginning of period, in dollars per share	[1]		$ 19.56	$ 22.60
Options granted, in dollars per share	[1]		0.00	0.00
Options exercised, in dollars per share	[1]		0.00	15.84
Options expired, in dollars per share	[1]		0.00	29.96
Balance outstanding, end of period, in dollars per share	[1]		19.56	19.56	$ 22.60
Options exercisable, in dollars per share	[1]		$ 19.56	$ 19.56
Weighted average remaining term, options outstanding			1 month 5 days	1 year 1 month 6 days
Weighted average remaining term, options exercisable			1 month 5 days
Aggregate Intrinsic Value
Balance outstanding, beginning of period | $	[2]		$ 0	$ 87
Balance outstanding, end of period | $	[2]		0	$ 0	$ 87
Options exercisable | $	[2]		$ 0

[1] Share and per share amounts have been retroactively updated to reflect the one-for-four reverse stock split effective as of December 5, 2016.

[2] Based on the Company's closing stock price of $15.50 on December 31, 2016 and $15.32 on December 31, 2015.