Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2016	Feb. 29, 2012
Stockholders Equity
Value of shares repurchased	$ 65
Treasury stock initiated for repurchase (in shares)		10,000
Repurchases unsettled (in shares)	0
Common Stock
Stockholders Equity
Authorized amount to repurchase				$ 50,000
Shares repurchased (in shares)	10,000		844,000
Treasury stock repurchased, average price per share (in dollars per share)			$ 5.74
Stock repurchase remaining authorized amount	$ 14,300
Treasury Stock
Stockholders Equity
Value of shares repurchased	$ 65		$ 4,900