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Acquisitions (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 01, 2012
Business Acquisition [Line Items]
Cash, net of cash acquired	$ 138,490	$ 52,688	$ 134,916
Goodwill		114,935us-gaap_GoodwillAcquiredDuringPeriod	45,665us-gaap_GoodwillAcquiredDuringPeriod
Actual Revenue	45,343
Actual Net Income	3,771
Pro forma revenue	2,000,978	1,946,643
Pro forma net income	142,959	148,747
Think Pets Inc [Member]
Business Acquisition [Line Items]
Cash, net of cash acquired				7,468
Issuance of common stock for acquisitions				10,500
Holdback				1,050
Fair value of total consideration transferred				19,018
Tangible assets				2,093
Identifiable intangible assets(1)				7,221
Goodwill				12,155
Other liabilities assumed				(2,451)
Recognized identifiable assets acquired, goodwill, and liabilities assumed, net				$ 19,018