Real Estate Assets and Construction in Progress (Summary of Owned or Leased Properties by the Company) (Details) $ in Thousands	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property
Real Estate Properties [Line Items]
Land	$ 165,109	$ 130,605
Buildings, Improvements and Equipment	2,839,261	2,178,901
Construction in progress	1,028,765	920,922
Total cost	4,033,135	3,230,428
Owned Properties | Atlanta, Georgia Campus
Real Estate Properties [Line Items]
Land	55,157	44,588
Buildings, Improvements and Equipment	700,142	525,300
Construction in progress	191,072	128,930
Total cost	946,371	698,818
Owned Properties | Ashburn, Virginia Campus
Real Estate Properties [Line Items]
Land	16,476	16,476
Buildings, Improvements and Equipment	371,725	156,396
Construction in progress	185,903	189,375
Total cost	574,104	362,247
Owned Properties | Irving, Texas
Real Estate Properties [Line Items]
Land	8,606	8,606
Buildings, Improvements and Equipment	392,275	369,727
Construction in progress	99,591	98,170
Total cost	500,472	476,503
Owned Properties | Chicago, Illinois
Real Estate Properties [Line Items]
Land	9,400	9,400
Buildings, Improvements and Equipment	250,336	205,026
Construction in progress	104,117	86,878
Total cost	363,853	301,304
Owned Properties | Richmond, Virginia
Real Estate Properties [Line Items]
Land	2,180	2,180
Buildings, Improvements and Equipment	233,927	195,684
Construction in progress	120,577	139,948
Total cost	356,684	337,812
Owned Properties | Suwanee, Georgia (Atlanta-Suwanee)
Real Estate Properties [Line Items]
Land	3,521	3,521
Buildings, Improvements and Equipment	184,467	174,124
Construction in progress	6,718	5,559
Total cost	194,706	183,204
Owned Properties | Piscataway, New Jersey
Real Estate Properties [Line Items]
Land	7,466	7,466
Buildings, Improvements and Equipment	122,176	103,553
Construction in progress	30,401	36,056
Total cost	160,043	147,075
Owned Properties | Fort Worth, Texas
Real Estate Properties [Line Items]
Land	9,079	9,079
Buildings, Improvements and Equipment	124,054	55,018
Construction in progress	1,064	35,722
Total cost	134,197	99,819
Owned Properties | Hillsboro, Oregon
Real Estate Properties [Line Items]
Land	18,414	0
Buildings, Improvements and Equipment	34,594	0
Construction in progress	78,390	63,573
Total cost	131,398	63,573
Owned Properties | Santa Clara, California
Real Estate Properties [Line Items]
Land	0	0
Buildings, Improvements and Equipment	117,343	114,499
Construction in progress	9,385	1,238
Total cost	126,728	115,737
Owned Properties | Eemshaven, Netherlands
Real Estate Properties [Line Items]
Land	5,366	0
Buildings, Improvements and Equipment	21,712	0
Construction in progress	47,531	37,267
Total cost	74,609	37,267
Owned Properties | Sacramento, California
Real Estate Properties [Line Items]
Land	1,481	1,481
Buildings, Improvements and Equipment	66,300	65,258
Construction in progress	12	163
Total cost	67,793	66,902
Owned Properties | Manassas, Virginia
Real Estate Properties [Line Items]
Land	0	0
Buildings, Improvements and Equipment	25	0
Construction in progress	67,073	57,662
Total cost	67,098	57,662
Owned Properties | Dulles, Virginia
Real Estate Properties [Line Items]
Land	3,154	3,154
Buildings, Improvements and Equipment	54,323	48,651
Construction in progress	4,148	4,688
Total cost	61,625	56,493
Owned Properties | Princeton, New Jersey
Real Estate Properties [Line Items]
Land	20,700	20,700
Buildings, Improvements and Equipment	35,261	35,192
Construction in progress	5	39
Total cost	55,966	55,931
Owned Properties | Phoenix, Arizona
Real Estate Properties [Line Items]
Land	0	0
Buildings, Improvements and Equipment	0	0
Construction in progress	37,729	31,265
Total cost	37,729	31,265
Owned Properties | Groningen, Netherlands
Real Estate Properties [Line Items]
Land	1,896	1,741
Buildings, Improvements and Equipment	11,206	9,085
Construction in progress	3,730	3,028
Total cost	16,832	13,854
Owned Properties | Other
Real Estate Properties [Line Items]
Land	2,213	2,213
Buildings, Improvements and Equipment	36,636	36,163
Construction in progress	41,094	120
Total cost	79,943	38,496
Leased Properties
Real Estate Properties [Line Items]
Land	0	0
Buildings, Improvements and Equipment	82,759	85,225
Construction in progress	225	1,241
Total cost	$ 82,984	$ 86,466
Number of facilities leased | property	7	7