Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
	2017					2016					2015
	Income		Shares	Per Share		Income		Shares	Per Share		Income		Shares	Per Share
Basic net income per common share:
Net income available to common stockholders	$	23,578	11,251	$	2.10	$	55,086	11,382	$	4.84	$	47,241	12,302	$	3.84
Effect of dilutive securities:
Warrants to purchase common stock	—		—			—		—			—		21
Non-vested restricted stock	—		16			—		25			—		49
Diluted net income per common share:
Net income available to common stockholders plus assumed conversions	$	23,578	11,267	$	2.09	$	55,086	11,407	$	4.83	$	47,241	12,372	$	3.82