Derivative Instruments, Fair Values Derivatives, Balance Sheet Location (Details) (Foreign Exchange Contract [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	$ 149	$ 92
Liability derivatives	78	24
Net fair value	71	68
Other Current Assets [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	109	71
Other Noncurrent Assets [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	40	21
Other Current Liabilities [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Liability derivatives	24	23
Other Noncurrent Liabilities [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Liability derivatives	$ 54	$ 1