Business Combination Disclosure [Text Block] (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		4 Months Ended	9 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Mar. 24, 2017
Revenues		$ 83,752	$ 78,542		$ 237,829	$ 232,133
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		5,213	$ 4,366		$ 24,529	$ 124,669
PetPartnersIncAcquiree,Member
Business Acquisition, Percentage of Voting Interests Acquired							8500.00%
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		1,416		$ 2,869
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		$ 112		$ 199