Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 28, 2017	Jul. 31, 2015	Feb. 28, 2015	Feb. 28, 2014
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		0	0
Stock repurchased during period		$ 377	$ 19,623	$ 10,000
Number of shares available for future stock repurchase program (in shares)		0
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		500,000
Preferred stock, par value (in dollars per share)		$ 20
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		30,000
Preferred stock, voting rights		Each share of the Series A Preferred Stock shall entitle the holder to one thousand votes
Stock Repurchase Program 2014 [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount								$ 10,000
Stock repurchased during period (in shares)				284,284
Stock repurchased during period				$ 10,000
Stock repurchase program, remaining authorized amount				$ 0
Stock Repurchase Program 2015 [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount						$ 10,000	$ 10,000
Stock repurchased during period (in shares)	10,135		551,791
Stock repurchased during period	$ 400		$ 19,600
Stock repurchase program, remaining authorized amount		$ 400
Subsequent Event [Member] | Stock Repurchase Program 2017 [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 20,000