Deferred Compensation Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Compensation Plan (Details) [Abstract]
Maximum deferral % of base compensation allowed to participants of deferred compensation plan	50.00%
Maximum deferral % of bonus compensation allowed to participants of deferred compensation plan	100.00%
Our matching cash contributions represents this % of contributions made by participants of deferred compensation plan	50.00%
Maximum employer contribution match % (of total eligible compensation) to each participant of deferred compensation plan	2.00%
Our discretionary contributions	$ 0.4	$ 0.6	$ 0.1
Deferred compensation plan liability	$ 8.3	$ 5.0