Stock Compensation (Details 2) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock Option Plan
Compensation expense	$ 200	$ 1,000		$ 1,100	$ 3,100
Payments for employees' tax obligations				941	1,021
Cash received under all share-based arrangements				0
Restricted stock units
Stock Option Plan
Fair value of restricted stock units vested				$ 2,600	$ 2,700
Shares withheld to cover withholding tax of unit holders				36,171	35,147
Payments for employees' tax obligations				$ 900	$ 1,000
Incremental value of additional expense			$ 600