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Commitments and Contingencies (Future Commitments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Payments due by period: |
Less than 1 year | $ 185,045 us-gaap_ContractualObligationDueInNextTwelveMonths
1-2 years | 20,577 us-gaap_ContractualObligationDueInSecondAndThirdYear
3-4 years | 0 us-gaap_ContractualObligationDueInFourthAndFifthYear
5 years and thereafter | 0 us-gaap_ContractualObligationDueAfterFifthYear
Total | $ 205,622 us-gaap_ContractualObligation

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fourth and fifth fiscal years following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthAndFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the second and third fiscal years following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondAndThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_ContractualObligationFiscalYearMaturityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration