Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Shareholders' Equity
Net unrealized loss from derivative instruments, tax benefit	$ (300)	$ 275	$ 174
Reclassification adjustment for losses included in net income, tax expense	$ 25