v2.4.0.8
Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jan. 02, 2013
Medmarc [Member]
Business Acquisition [Line Items]          
Fixed maturities, available for sale         $ 269,529
Equity securities, trading         30,976
Cash and short-term investments         24,008
Other investments         5,340
Premiums receivable         2,986
Receivable from reinsurers on unpaid losses and LAE         73,107
Intangible assets         3,630
Other assets         14,614
Reserve for losses and loss adjustment expenses         (201,072)
Unearned premiums         (16,937)
Deferred tax liabilities         (2,453)
Other liabilities         (14,536)
Fair value of net assets acquired         189,192
Gain on Acquisition 0 0 (35,492) 0 (35,492)
Total purchase consideration         153,700
ProAssurance Consolidated results          
Proforma Consolidated Results, Revenue 170,805 174,284 365,779 364,961  
Proforma Consolidated Results, Earnings 49,887 58,906 126,990 151,683  
Revenue 170,805 163,869 365,779 344,440  
Net income $ 50,451 $ 58,453 $ 163,301 $ 114,098