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Other Balance Sheet Items Other Balance Sheet (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Senior Notes [Member]  
Senior notes [Line Items]  
Debt Issuance Cost $ 6,500us-gaap_DebtIssuanceCosts
/ us-gaap_InvestmentTypeAxis
= us-gaap_SeniorNotesMember
Revolving Credit Facility [Member]  
Senior notes [Line Items]  
Debt Issuance Cost $ 1,300us-gaap_DebtIssuanceCosts
/ us-gaap_InvestmentTypeAxis
= us-gaap_RevolvingCreditFacilityMember