CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income (loss)	$ 62,772	$ 5,335	$ (223,779)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	25,625	20,242	16,502
Amortization of intangibles	123,142	90,550	109,534
Operating lease expense	17,485	20,928	19,113
Asset impairment charges	0	101,749	421,090
Amortization of prepaid product discounts	31,784	29,235	24,055
Deferred income taxes	17,758	(5,456)	(41,178)
Employee share-based compensation expense	29,477	21,824	19,702
Other non-cash items, net	17,196	25,692	13,344
Changes in assets and liabilities, net of effect of acquisitions:
Trade accounts receivable	(8,857)	(2,709)	5,609
Inventories and supplies	(1,842)	(11,281)	4,843
Other current assets	(15,574)	15,344	(10,568)
Payments for cloud computing arrangements	(41,547)	(19,426)	0
Other non-current assets	(11,467)	(6,367)	(5,360)
Accounts payable	22,794	(9,518)	5,130
Prepaid product discount payments	(40,920)	(33,613)	(25,637)
Other accrued and non-current liabilities	(17,005)	(24,976)	(45,747)
Net cash provided by operating activities	210,821	217,553	286,653
Cash flows from investing activities:
Purchases of capital assets	(109,140)	(62,638)	(66,595)
Payments for acquisitions, net of cash, cash equivalents, restricted cash and restricted cash equivalents acquired	(958,514)	0	(8,251)
Purchases of customer lists	(2,759)	(11,082)	0
Proceeds from sale of facilities	2,648	9,713	0
Purchases of customer funds debt securities	(93)	(3,918)	(7,642)
Proceeds from customer funds debt securities	93	7,764	7,642
Other	1,164	4,068	2,449
Net cash used by investing activities	(1,066,601)	(56,093)	(72,397)
Cash flows from financing activities:
Proceeds from issuing long-term debt	1,884,850	309,000	241,500
Payments on long-term debt	(1,029,876)	(352,500)	(268,000)
Payments for debt issuance costs	(18,153)	0	0
Net change in customer funds obligations	126,703	(168)	12,598
Proceeds from issuing shares	16,843	3,747	3,198
Employee taxes paid for shares withheld	(5,969)	(2,956)	(3,935)
Payments for common shares repurchased	0	(14,000)	(118,547)
Cash dividends paid to shareholders	(51,654)	(50,746)	(51,742)
Other	(9,783)	(2,932)	(5,220)
Net cash provided (used) by financing activities	912,961	(110,555)	(190,148)
Effect of exchange rate change on cash, cash equivalents, restricted cash and restricted cash equivalents	(1,099)	3,693	5,444
Net change in cash, cash equivalents, restricted cash and restricted cash equivalents	56,082	54,598	29,552
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning of year	229,409	174,811	145,259
Cash, cash equivalents, restricted cash and restricted cash equivalents, end of year (Note 3)	$ 285,491	$ 229,409	$ 174,811