Income Taxes Operating losses and credit carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 47,796	$ 41,405
Tax Credit Carryforward, Amount	1,235	1,369
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	15,535	24,168
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	25,849	38,152
Tax Credit Carryforward, Amount	$ 34,278	$ 29,462