Basis of presentation Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Income and Expenses [Abstract]
Professional Fees	$ 530	$ 560	$ 1,341	$ 2,202
Interest income included in other income	1,272	1,994	2,136	3,767
Gain (Loss) on Investments	5,378	(229)	11,211	756
Other income	$ 7,180	$ 2,325	$ 14,688	$ 6,725