Commitments And Contingencies (Narrative) (Details) $ in Thousands, PLN in Millions	3 Months Ended			13 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2014 PLN	Dec. 31, 2014 USD ($)	Dec. 31, 2013 PLN	Dec. 31, 2013 USD ($)	Mar. 31, 2016 PLN	Mar. 31, 2016 USD ($)	Dec. 31, 2015 PLN	Dec. 31, 2015 USD ($)
Commitments and Contingencies [Line items]
Contingent liability							$ 2,307		$ 2,180
Review Of Tax Year 2011 [Member]
Commitments and Contingencies [Line items]
Paid to Polish IRS				PLN 3.6	$ 1,200
Review Of Tax Period December 2007 To December 2008 [Member]
Commitments and Contingencies [Line items]
Paid to Polish IRS	$ 900	PLN 2.8	$ 900
Review of Tax Year 2010 [Member]
Commitments and Contingencies [Line items]
Contingent liability								PLN 3.4	$ 900
Review of All Tax Open Periods [Member]
Commitments and Contingencies [Line items]
Contingent liability						PLN 8.6	$ 2,300