Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Reclassification of impact of ASU 2016-09 (see Note 1)		$ 687	$ (536)		$ 151
Adjusted balance	$ 5	180,879	(65,521)	$ (11)	115,352
Balance at Dec. 31, 2015	$ 5	180,192	(64,985)	(11)	115,201
Balance (in shares) at Dec. 31, 2015	51,437,973
Issuance of restricted shares (in shares)	73,384
Stock based compensation		4,333			4,333
Stock option exercises		786			786
Stock option exercises (in shares)	95,786
Foreign currency translation adjustments				(35)	(35)
Net income			18,463		$ 18,463
Balance (in shares) at Dec. 31, 2016	51,607,143				51,607,143
Balance at Dec. 31, 2016	$ 5	185,998	(47,058)	(46)	$ 138,899
Issuance of restricted shares (in shares)	20,000
Cancellation of restricted shares (in shares)	(5,000)
Stock based compensation		842			842
Stock option exercises		10			10
Stock option exercises (in shares)	7,117
Dividends paid			(2,581)		(2,581)
Foreign currency translation adjustments				5	5
Net income			8,009		$ 8,009
Balance (in shares) at Mar. 31, 2017	51,629,260				51,629,260
Balance at Mar. 31, 2017	$ 5	$ 186,850	$ (41,630)	$ (41)	$ 145,184