Fair Value Measurements (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable-rate long-term debt, Carrying Value	$ 600,000,000	$ 556,914,000
Variable-rate long-term debt, Fair Value	600,000,000	556,914,000
Goodwill impairment charge	9,200,000	9,246,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Vetstreet [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Goodwill impairment charge	9,200,000
Impairment charge of long-lived assets	17,800,000
Long-lived assets	$ 5,000,000