Derivative Instruments (Narrative) (Details)	1 Months Ended				6 Months Ended	12 Months Ended
	Jun. 30, 2014 USD ($) contract		Mar. 31, 2014 contract	Dec. 31, 2013 JPY (¥) contract	Jun. 30, 2014 Other Comprehensive Income (Loss) [Member] USD ($)	Dec. 31, 2013 Other Comprehensive Income (Loss) [Member] USD ($)	Mar. 31, 2014 Foreign Exchange Contracts [Member]	Aug. 31, 2013 Foreign Exchange Contract 1 [Member] USD ($)	Aug. 31, 2013 Foreign Exchange Contract 1 [Member] MXN	Nov. 30, 2013 Foreign Exchange Contract 2 [Member] USD ($)	Nov. 30, 2013 Foreign Exchange Contract 2 [Member] MXN	Jun. 30, 2014 July Foreign Exchange Contract [Member] JPY (¥) item contract
Derivative Instruments, Gain (Loss) [Line Items]
Maximum potential future exposure on derivatives	$ 3,900,000
Unrealized loss related to derivative instruments included in accumulated other comprehensive loss					4,300,000	4,300,000
Number of forward purchase contracts				2
Number of foreign currency derivatives held				3								4
Number of contracts which coincide to the next three scheduled quarterly loan installments												3
Number of quarterly loan installments coincided by contracts												3
Derivatives, current notional amount	46,482,000	[1]		3,300,000,000				1,200,000		600,000		3,100,000,000
Exchange rate				102.53					13.6103		13.3003
Projected Peso exposure represented by Mexican Peso foreign exchange contracts (in hundredths)							60.00%
Number of expired contracts	1		1
Approximate amount of quarterly loan installments												85,000,000
Approximate exchange rate												102.26
Derivatives, notional amount remaining after quarterly loan installments												¥ 2,885,000,000

[1] Notional amount converted from Yen at June 30, 2014 at a Yen to USD exchange rate of 101.33.