Fair Value Measurements (Details) (USD $)	6 Months Ended
	Jun. 30, 2014 business	Dec. 31, 2013	Jun. 30, 2014 Senior Subordinated 6.25% Notes	Dec. 31, 2013 Senior Subordinated 6.25% Notes	Mar. 31, 2013 Senior Subordinated 6.25% Notes
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Number of completed acquisitions	1
Carrying value of outstanding debt	$ 213,600,000	$ 214,007,000	$ 210,000,000	$ 210,000,000
Senior Subordinated Notes, interest rate			6.25%		6.25%