Derivatives - Contracts Held (Details) (Euro, Not Designated as Hedging Instrument [Member], Foreign Exchange Forward [Member], USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013 July 26, 2013 [Member]		Dec. 31, 2012 January 18, 2013 [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 6,000,000		$ 5,000,000
Derivative, Forward Exchange Rate	1.3405		1.3228
Gain (Loss) Recorded at Balance Sheet Date	$ (172,000)	[1]	$ (13,000)	[1]

[1] Gains on futures contracts are recorded in prepaid expenses and other current assets. Losses on futures contracts are recorded in other accrued expenses.