Other Comprehensive Income (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
After Tax
Net current period other comprehensive income	$ (56)
Available-for-sale security
Before tax
Beginning balance	92
Other comprehensive income / (loss) before reclassification	(30)
Amounts reclassified from accumulated other comprehensive income to other income / (expense), net	(62)
Net current period other comprehensive income	(92)
Ending balance	0
Tax
Beginning balance	(36)
Other comprehensive income / (loss) before reclassification	11
Amounts reclassified from accumulated other comprehensive income to other income / (expense), net	25
Net current period other comprehensive income	36
Ending balance	0
After Tax
Beginning balance	56
Other comprehensive income / (loss) before reclassification	(19)
Amounts reclassified from accumulated other comprehensive income to other income / (expense), net	(37)
Net current period other comprehensive income	(56)
Ending balance	$ 0