Defined Contribution and 401(k) Plans (Details) (Retirement Savings Plan under Section 401 (k) [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Retirement Savings Plan under Section 401 (k) [Member]
Additional Defined Contribution And 401(k) (Textual) [Abstract]
Percentage of maximum limit for employees to contribute their cash compensation	75.00%
Percentage of employee compensation plus matching contribution	100.00%
Percentage of employee contribution	3.00%
Percentage of employers matching contribution	50.00%
Percentage of additional employee contribution	2.00%
Total plan expenses		$ 4.1	$ 4.1	$ 2.9