Summary of Selected Significant Accounting Policies (Details 3) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended					3 Months Ended			3 Months Ended
	Jan. 01, 2002	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Jan. 01, 2003 USD ($)	Jan. 01, 2003 CZK	Jun. 30, 1998	Mar. 31, 2015 German reporting unit USD ($)	Jan. 01, 2003 German reporting unit USD ($)	Jan. 01, 2003 German reporting unit CZK	Mar. 31, 2015 Austrian reporting unit USD ($)	Jan. 01, 2003 Austrian reporting unit USD ($)	Jan. 01, 2003 Austrian reporting unit CZK
Impact of foreign currency translation on goodwill
Applicable Foreign Exchange Rate ("FX")		25.5860				33.8830
Residual balance		$ 4,740		$ 3,579	121,267		$ 4,029	$ 3,042	103,072	$ 711	$ 537	18,195
Net cumulative change to goodwill due to foreign currency translation		1,161					987			174
Period over which goodwill was amortized	15 years
Stock-based Compensation
Stock-based compensation		$ 15	$ 0
Share repurchase
Issuable shares under the Company's Deferred Compensation Plan		423,664	309,606