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Segment Information - Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Information [Line Items]
Revenues	$ 1,066,907	$ 1,060,823	$ 2,120,770	$ 2,103,281
Depreciation and Amortization	164,331	156,220	326,814	316,798
Depreciation	113,722	111,501	228,333	224,933
Amortization	50,609	44,719	98,481	91,865
Adjusted EBITDA	350,942	367,555	675,448	703,130
Total Assets	13,720,982	11,817,159	13,720,982	11,817,159	$ 11,857,218
Expenditures for Segment Assets	210,244	379,078	502,344	1,921,703
Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	182,366	121,996	367,131	217,601
Cash Paid for Acquisitions, Net of Cash Acquired	5,228	237,895	44,651	1,666,869
Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs	22,650	19,187	90,562	37,233
North American Records and Information Management Business
Segment Information [Line Items]
Revenues	539,273	539,080	1,066,653	1,065,923
Depreciation and Amortization	62,691	60,970	122,693	123,722
Depreciation	46,655	48,252	92,407	97,390
Amortization	16,036	12,718	30,286	26,332
Adjusted EBITDA	245,585	244,861	469,268	470,599
Total Assets	5,840,023	5,010,186	5,840,023	5,010,186
Expenditures for Segment Assets	46,545	41,364	102,810	84,545
Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	28,596	25,122	57,284	54,992
Cash Paid for Acquisitions, Net of Cash Acquired	0	0	9,876	1,551
Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs	17,949	16,242	35,650	28,002
North American Data Management Business
Segment Information [Line Items]
Revenues	96,415	100,031	193,162	199,995
Depreciation and Amortization	10,100	9,538	20,302	19,642
Depreciation	7,818	7,217	15,831	15,240
Amortization	2,282	2,321	4,471	4,402
Adjusted EBITDA	53,068	55,280	103,620	109,132
Total Assets	877,777	829,682	877,777	829,682
Expenditures for Segment Assets	5,254	3,643	10,886	10,496
Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	5,254	3,643	10,886	10,496
Cash Paid for Acquisitions, Net of Cash Acquired	0	0	0	0
Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs	0	0	0	0
Western European Business
Segment Information [Line Items]
Revenues	127,327	133,440	256,080	267,515
Depreciation and Amortization	14,328	17,500	29,585	35,056
Depreciation	10,476	11,821	21,423	24,579
Amortization	3,852	5,679	8,162	10,477
Adjusted EBITDA	44,163	46,594	83,372	90,560
Total Assets	1,406,937	1,344,699	1,406,937	1,344,699
Expenditures for Segment Assets	24,334	27,559	54,435	35,039
Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	22,724	25,096	24,840	31,143
Cash Paid for Acquisitions, Net of Cash Acquired	366	0	11,850	0
Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs	1,244	2,463	17,745	3,896
Other International Business
Segment Information [Line Items]
Revenues	199,823	207,527	400,779	418,294
Depreciation and Amortization	30,760	30,364	61,359	62,237
Depreciation	17,833	18,199	36,051	37,263
Amortization	12,927	12,165	25,308	24,974
Adjusted EBITDA	58,749	60,452	116,873	121,199
Total Assets	2,703,347	2,247,071	2,703,347	2,247,071
Expenditures for Segment Assets	18,829	30,287	50,083	62,447
Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	11,955	13,921	27,104	39,063
Cash Paid for Acquisitions, Net of Cash Acquired	4,862	16,188	19,405	19,396
Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs	2,012	178	3,574	3,988
Global Data Center Business
Segment Information [Line Items]
Revenues	62,291	54,895	123,827	101,498
Depreciation and Amortization	32,671	22,503	64,303	44,771
Depreciation	19,027	13,120	38,040	24,500
Amortization	13,644	9,383	26,263	20,271
Adjusted EBITDA	27,641	24,901	53,652	45,691
Total Assets	2,330,535	1,909,088	2,330,535	1,909,088
Expenditures for Segment Assets	102,477	265,173	256,182	1,703,185
Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	101,032	43,162	222,589	56,273
Cash Paid for Acquisitions, Net of Cash Acquired	0	221,707	0	1,645,922
Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs	1,445	304	33,593	990
Corporate and Other Business
Segment Information [Line Items]
Revenues	41,778	25,850	80,269	50,056
Depreciation and Amortization	13,781	15,345	28,572	31,370
Depreciation	11,913	12,892	24,581	25,961
Amortization	1,868	2,453	3,991	5,409
Adjusted EBITDA	(78,264)	(64,533)	(151,337)	(134,051)
Total Assets	562,363	476,433	562,363	476,433
Expenditures for Segment Assets	12,805	11,052	27,948	25,991
Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	12,805	11,052	24,428	25,634
Cash Paid for Acquisitions, Net of Cash Acquired	0	0	3,520	0
Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs	0	0	0	357
Storage rental
Segment Information [Line Items]
Revenues	669,288	655,439	1,332,262	1,306,588
Storage rental | North American Records and Information Management Business
Segment Information [Line Items]
Revenues	313,355	305,895	620,341	610,714
Storage rental | North American Data Management Business
Segment Information [Line Items]
Revenues	66,750	68,808	133,322	138,054
Storage rental | Western European Business
Segment Information [Line Items]
Revenues	78,554	82,439	159,249	166,391
Storage rental | Other International Business
Segment Information [Line Items]
Revenues	128,898	129,611	258,371	261,358
Storage rental | Global Data Center Business
Segment Information [Line Items]
Revenues	60,582	51,945	120,300	97,440
Storage rental | Corporate and Other Business
Segment Information [Line Items]
Revenues	21,149	16,741	40,679	32,631
Service
Segment Information [Line Items]
Revenues	397,619	405,384	788,508	796,693
Service | North American Records and Information Management Business
Segment Information [Line Items]
Revenues	225,918	233,185	446,312	455,209
Service | North American Data Management Business
Segment Information [Line Items]
Revenues	29,665	31,223	59,840	61,941
Service | Western European Business
Segment Information [Line Items]
Revenues	48,773	51,001	96,831	101,124
Service | Other International Business
Segment Information [Line Items]
Revenues	70,925	77,916	142,408	156,936
Service | Global Data Center Business
Segment Information [Line Items]
Revenues	1,709	2,950	3,527	4,058
Service | Corporate and Other Business
Segment Information [Line Items]
Revenues	$ 20,629	$ 9,109	$ 39,590	$ 17,425

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