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Reinsurance (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) reinsurer | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Ceded Credit Risk [Line Items] |  |  |
Premium ceded reduction amount | $ 1,100,000 | $ 15,700,000 | $ 16,400,000
Amount due from reinsurers total | $ 262,500,000 |  |
Number of major reinsurers | reinsurer | 0 |  |
Allowance for reinsurance receivables | $ 0 | 0 |
Loss on uncollectible accounts in the period | 0 | $ 0 | $ 0
Ceded Credit Risk, Secured [Member] |  |  |
Ceded Credit Risk [Line Items] |  |  |
Amount of reinsurance recoverables collateralized by letters of credit | 47,000,000 |  |
Minimum [Member] |  |  |
Ceded Credit Risk [Line Items] |  |  |
Major reinsurer threshold | $ 25,000,000 |  |

X
- Definition Total amounts due from reinsurers including receivables related to paid and unpaid losses and LAE and prepaid reinsurance premiums, less reinsurance premiums payable + References No definition available. + Details
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Namespace Prefix: | pra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Ceded premiums earned prior accident years. + References No definition available. + Details
Name: | pra_CededPremiumsEarnedPriorAccidentYears
Namespace Prefix: | pra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Major reinsurer individual balance amount. + References No definition available. + Details
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Namespace Prefix: | pra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of reinsurers with a balance greater than the major reinsurer individual balance amount threshold + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

X
- Definition Amount of the write-down or write-off of a receivable from a reinsurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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Period Type: | duration

X
- Definition Amount of valuation allowance for reinsurance recoverables. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount after valuation allowance recoverable under reinsurance contracts, including, but not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Period Type: |