Debt (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Summary of short-term lines of credit
Available	$ 334,800
Short-term Debt [Member]
Summary of short-term lines of credit
Total	334,809	362,492
Outstanding	0	34,953
Available	334,809	327,539
Domestic [Member] \| Short-term Debt [Member]
Summary of short-term lines of credit
Total	322,475	320,510
Outstanding	0	6,291
Available	322,475	314,219
Foreign [Member] \| Short-term Debt [Member]
Summary of short-term lines of credit
Total	12,334	13,320
Outstanding	0	0
Available	12,334	13,320
Precious metal [Member] \| Short-term Debt [Member]
Summary of short-term lines of credit
Total	0	28,662
Outstanding	0	28,662
Available	$ 0	$ 0

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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