Trade and Finance Receivables - Trade Receivables (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended						12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Iranian customers	Dec. 31, 2013 Iranian customers	Sep. 30, 2013 Iranian customers	Dec. 31, 2013 Iranian customers Customer not able to find acceptable methods of payment	Dec. 31, 2012 Iranian customers Customer not able to find acceptable methods of payment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables, less allowances with Iranian customers	$ 248,617	$ 269,892	$ 252,068	$ 9,000	$ 17,000	$ 17,000
Trade receivables reserved amounts related to customers	$ 5,085	$ 3,141					$ 2,000	$ 9,000