Summary of Significant Accounting Policies, Derivative Instruments, Fair Values Derivatives, Balance Sheet Location (Details) - Foreign Exchange Contract [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	$ 121	$ 92
Liability derivatives	57	24
Net fair value	64	68
Other Current Assets [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	115	71
Other Noncurrent Assets [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	6	21
Other Current Liabilities [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Liability derivatives	57	23
Other Noncurrent Liabilities [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Liability derivatives	$ 0	$ 1