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Commitments and Contingencies Commitment and Contingencies (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Litigation Settlement, Amount Awarded from Other Party | $ 12.8

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration