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Share Repurchase (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Aug. 06, 2015
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Equity [Abstract] |  |
Stock repurchase program, authorized amount |  | $ 100.0
Stock repurchase program, remaining authorized repurchase amount | $ 52.0 |

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

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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