Derivative Instruments (Narrative) (Details)	1 Months Ended				9 Months Ended	12 Months Ended
	Jun. 30, 2014 contract	Mar. 31, 2014 contract	Sep. 30, 2014 USD ($)	Dec. 31, 2013 JPY (¥) contract	Sep. 30, 2014 Other Comprehensive Income (Loss) [Member] USD ($)	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 ($)	Nov. 30, 2013 Foreign Exchange Contract 2 [Member] MXN	Sep. 30, 2014 Foreign Exchange Contract 3 [Member] USD ($)	Sep. 30, 2014 Foreign Exchange Contract 3 [Member] MXN	Sep. 30, 2014 July Foreign Exchange Contract [Member] JPY (¥) contract item
Derivative Instruments, Gain (Loss) [Line Items]
Maximum potential future exposure on derivatives			$ 5,400,000
Unrealized loss related to derivative instruments included in accumulated other comprehensive loss					3,900,000	4,300,000
Number of forward purchase contracts				2
Number of foreign currency derivatives held				3										4
Number of quarterly loan installments coincided by contracts														2
Derivatives, current notional amount				3,300,000,000				1,200,000		600,000		900,000		3,100,000,000
Exchange rate				102.53					13.6103		13.3003		13.6007
Projected Peso exposure represented by Mexican Peso foreign exchange contracts (in hundredths)							25.00%
Number of expired contracts	1	1
Approximate amount of quarterly loan installments														85,000,000
Derivatives, notional amount remaining after quarterly loan installments														¥ 2,885,000,000