Derivative Instruments (Details) (Foreign currency sales contracts [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Noncurrent assets for cash flow hedge contracts [Member]
Location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets
Cash flow hedge contracts	$ 0	$ 57
Noncurrent assets for fair value hedge contracts [Member]
Location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets
Fair value hedge contracts	0	112
Accounts receivable for fair value hedged item [Member]
Location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets
Fair value hedged item	(94)	(72)
Noncurrent liability for fair value hedged item [Member]
Location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets
Fair value hedged item	0	116
Other current assets [Member]
Location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets
Cash flow hedge contracts	46	256
Fair value hedge contracts	218	107
Other current liabilities [Member]
Location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets
Fair value hedged item	$ 223	$ 174