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Reinsurance (Narrative) (Details)	12 Months Ended
	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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X

- Definition

Ceded premiums earned prior accident years.

+ References

No definition available.

+ Details

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Namespace Prefix:	pra_
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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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Namespace Prefix:	pra_
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X

- 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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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

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Namespace Prefix:	us-gaap_
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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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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

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- Details

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