Shareholders' Equity, Other Comprehensive Income and Earnings Per Common Share - Shareholders' Equity (Common Shares) (Details) - USD ($) $ in Thousands		12 Months Ended
	May 14, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common stock
Repurchase of warrant				$ 2,303
Common
Common stock
Shares repurchased		0	38,759
Restricted Stock Tax Withholding Repurchases | Common
Common stock
Shares repurchased		9,169	8,745	1,808
Warrant To Purchase Common Stock at $17.91 per share
Common stock
Repurchase of warrant	$ 2,300