Preferred Stock (Series D Convertible Preferred Stock) (Narrative) (Details) $ / shares in Units, $ in Thousands			3 Months Ended	12 Months Ended
	Feb. 28, 2017 $ / shares shares	Mar. 16, 2016 $ / shares shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 shares	Mar. 29, 2017 $ / shares
Class of Stock [Line Items]
Preferred stock, partial redemption value | $			$ 30,000
Shares issued, price per share					$ 10.50
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares outstanding | shares		6,245,156		6,245,156
Preferred stock, annual dividend rate		6.25%		6.25%
Preferred stock, face value		$ 10.00
Percentage of voting stock		40.00%
Conversion price per share		$ 10.40
Preferred stock, conversion ratio		0.9615385
Series D Preferred Stock [Member] | On Or Before March 16, 2019 [Member]
Class of Stock [Line Items]
Preferred stock, redemption price			$ 12.00
Series D Preferred Stock [Member] | March 16, 2019 to March 16, 2020 [Member]
Class of Stock [Line Items]
Preferred stock, redemption price			13.00
Series D Preferred Stock [Member] | On Or After March 16, 2020 [Member]
Class of Stock [Line Items]
Preferred stock, redemption price			14.00
Series D Preferred Stock [Member] | On Or Before September 30,2021 [Member]
Class of Stock [Line Items]
Preferred stock, redemption price			$ 14.00
Aggregate outstanding shares required for liquidation election			40.00%
Series D Preferred Stock [Member] | After September 30, 2021 [Member]
Class of Stock [Line Items]
Preferred stock, annual dividend rate			12.50%
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, annual dividend rate	6.25%		6.25%
Preferred stock, face value	$ 10.00
Redeemable preferred stock, shares issued | shares	925,000
Common Stock [Member]
Class of Stock [Line Items]
Shares issued upon conversion | shares	6,004,957
Shares issued, price per share	$ 10.40