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Unconditional Purchase Obligations	12 Months Ended
Unconditional Purchase Obligations	Dec. 31, 2012
Unconditional Purchase Obligations (Excluding Capital Stock Redemptions) [Abstract]
Unconditional Purchase Obligations	Unconditional Purchase Obligations The Company has entered into various unconditional purchase obligations which primarily include software licenses and long-term purchase contracts for network, communication and office maintenance services. The Company expended $4.0 million, $5.0 million and $2.9 million related to unconditional purchase obligations that existed as of the beginning of each year for the years ended December 31, 2012, 2011 and 2010, respectively. Future expenditures under these obligations in effect at December 31, 2012 are $3.3 million in 2013, $0.2 million in 2014 and $30,000 in 2015.