Commitments And Contingencies (LC Issuance Agreement) (Details)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 LC Issuance Agreement [Member] USD ($)	Mar. 31, 2015 LC Issuance Agreement [Member] GBP (£)	Mar. 31, 2015 LC Issuance Agreement [Member] Alba [Member] GBP (£)	Mar. 31, 2015 LC Issuance Agreement [Member] IVRRH [Member] GBP (£)	Mar. 31, 2015 LC Issuance Agreement [Member] Renee And Rubie [Member] GBP (£)	Mar. 31, 2015 Amended Term Loan Facility [Member] USD ($)	Sep. 30, 2014 Amended Term Loan Facility [Member] USD ($)
Line of Credit Facility [Line Items]
Letters of credit amount				£ 63,100,000	£ 42,500,000	£ 11,900,000	£ 8,700,000
Restricted Cash, Long-Term Portion	95,356,000	100,241,000	95,400,000
Amount advanced								$ 440,000,000	$ 440,000,000