Contracts-In-Process And Long-Term Receivables (Credit Quality Of Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	$ 101,000	$ 417,496
Rating Categories, A/BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	101,000	41,607
Rating Categories, BB/B [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables		246,373
Rating Categories, B/CCC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables		94,156
Rating Categories, Customers In Bankruptcy [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables		39,307
Rating Categories, Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables		$ (3,947)