Capital Stock - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Repurchase Program	Jun. 18, 2013 Repurchase Program	Dec. 31, 2012 2012 Program
Class Of Stock [Line Items]
Common stock available for sale	200,000,000	200,000,000			10,000,000
Common stock share authorized to repurchase				10,000,000
Stock repurchased during period, shares			100,000
Stock repurchased during period, value			$ 1,912