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Segment Information (Reconciliation of Interest Expense from Segments to Consolidated) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Interest expense $ 96,700us-gaap_InterestExpense $ 124,307us-gaap_InterestExpense $ 105,348us-gaap_InterestExpense
Corporate Segment [Member]      
Segment Reporting Information [Line Items]      
Interest expense $ 96,700us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ 124,307us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ 105,348us-gaap_InterestExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember