Equity Incentive Plans (Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Recognized compensation expenses
Stock option plan expense	$ 538	$ 727	$ 1,161
Restricted stock expense	$ 12,235	$ 10,982	$ 7,748