Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent	3.00%
Maximum annual contribution per employee, percent	50.00%
Employers maximum additional match, percentage	2.00%
Employers matching contribution, annual vesting percentage	4.00%
Defined Contribution Plan, Cost Recognized	$ 2.3	$ 1.8	$ 1.7
Company's cash contribution to deferred compensation plans	0.1	0.1	0.1
Noncontributory Defined Benefit Multi-Employer Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Retirement plan expense	$ 0.7	$ 0.6	$ 0.6