Pension and Other Post-Retirement Plans - 401(k) Plan (Details) (USD $)	3 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2013 WMS Acquisition	Jan. 31, 2010 Employee 401(k) Plan	Dec. 31, 2013 Employee 401(k) Plan	Dec. 31, 2012 Employee 401(k) Plan	Dec. 31, 2011 Employee 401(k) Plan
Defined Contribution Plan
Maximum percentage of participant contributions eligible for Employer contribution match, towards defined contribution plan		6.00%	6.00%
Employer's matching contribution on the dollar for the first 6 percent of participant contributions		$ 0.375
Percentage of employer's contribution under 401(k) plan matching up to 6 percent of participant contributions subject to maximum percentage of eligible compensation		2.25%
Contribution expense	$ 200,000		$ 1,800,000	$ 1,700,000	$ 1,400,000
Maximum annual contribution per employee, percent	4.50%