Earnings (Loss) Per Common Share - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended		39 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Oct. 31, 2013
Computation Of Earnings Per Share Line Items
Repurchase of common stock	$ 1,634,000	$ 1,627,000
Common Stock Repurchase Plan
Computation Of Earnings Per Share Line Items
Shares repurchased	109	122	282
Repurchase of common stock	$ 1,600,000	$ 1,600,000	$ 3,800,000
Shares repurchased, average cost per share	$ 14.93	$ 13.29	$ 13.43
Maximum
Computation Of Earnings Per Share Line Items
Outstanding common stock repurchase program authorized amount				$ 10,000,000