BusinessCombinationAndDeconsolidationDisclosure (Details) - USD ($) $ in Thousands	1 Months Ended	10 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 24, 2017
Revenues			$ 350,775	$ 320,494
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			$ 29,053	$ 42,130
PetPartnersIncAcquiree,Member
Business Acquisition, Percentage of Voting Interests Acquired					85.00%
Business Combination, Consideration Transferred	$ 12,713
Goodwill, Acquired During Period	$ 9,124
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					$ 5,880
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value					2,005
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					$ 5,594
Revenues		$ 4,468
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 691