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Share Repurchases (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2015
--- | --- | ---
Equity [Abstract] |  |
Stock repurchase program, authorized amount |  | $ 100,000,000
Stock repurchase program, remaining authorized repurchase amount | $ 49,000,000 |

X
- 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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