Out of Period Adjustment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Accounting Changes and Error Corrections [Abstract]
Immaterial Error Correction	During the first quarter of 2013, the Company identified errors in Primex’s estimated 2012 financial statements, which primarily related to a reinsurance contract held by Primex. The identified errors resulted in a cumulative $1,038 understatement of the Company’s equity in net income from associated companies for the year ended December 31, 2012. The Company corrected the errors related to Primex in the first quarter of 2013, which had the net effect of increasing equity in net income from associated companies by $1,038 for the three months ended March 31, 2013 and the nine months ended September 30, 2013. The Company does not believe this adjustment is material to the consolidated financial statements for the year ended December 31, 2012 or to the Company’s projected results for the current year and, therefore, has not restated any prior period amounts.
Amount of Error Correction	$ 1,038