Real Estate Assets and Construction in Progress (Summary of Owned or Leased Properties by the Company) (Details) $ in Thousands	Jun. 30, 2020 USD ($) facility	Dec. 31, 2019 USD ($) facility
Real Estate Properties [Line Items]
Land	$ 149,023	$ 130,605
Buildings, Improvements and Equipment	2,487,379	2,178,901
Construction in progress	976,257	920,922
Owned Properties
Real Estate Properties [Line Items]
Land	149,023	130,605
Buildings, Improvements and Equipment	2,487,379	2,178,901
Construction in progress	976,257	920,922
Total cost	3,612,659	3,230,428
Owned Properties | Atlanta, Georgia Campus
Real Estate Properties [Line Items]
Land	44,588	44,588
Buildings, Improvements and Equipment	563,509	525,300
Construction in progress	235,947	128,930
Total cost	844,044	698,818
Owned Properties | Irving, Texas
Real Estate Properties [Line Items]
Land	8,606	8,606
Buildings, Improvements and Equipment	372,151	369,727
Construction in progress	110,589	98,170
Total cost	491,346	476,503
Owned Properties | Ashburn, Virginia
Real Estate Properties [Line Items]
Land	16,476	16,476
Buildings, Improvements and Equipment	307,744	156,396
Construction in progress	114,152	189,375
Total cost	438,372	362,247
Owned Properties | Richmond, Virginia
Real Estate Properties [Line Items]
Land	2,180	2,180
Buildings, Improvements and Equipment	197,334	195,684
Construction in progress	143,850	139,948
Total cost	343,364	337,812
Owned Properties | Chicago, Illinois
Real Estate Properties [Line Items]
Land	9,400	9,400
Buildings, Improvements and Equipment	235,304	205,026
Construction in progress	82,570	86,878
Total cost	327,274	301,304
Owned Properties | Suwanee, Georgia (Atlanta-Suwanee)
Real Estate Properties [Line Items]
Land	3,521	3,521
Buildings, Improvements and Equipment	176,161	174,124
Construction in progress	3,117	5,559
Total cost	182,799	183,204
Owned Properties | Piscataway New Jersey
Real Estate Properties [Line Items]
Land	7,466	7,466
Buildings, Improvements and Equipment	113,795	103,553
Construction in progress	33,035	36,056
Total cost	154,296	147,075
Owned Properties | Santa Clara, California
Real Estate Properties [Line Items]
Buildings, Improvements and Equipment	116,638	114,499
Construction in progress	447	1,238
Total cost	117,085	115,737
Owned Properties | Fort Worth, Texas
Real Estate Properties [Line Items]
Land	9,079	9,079
Buildings, Improvements and Equipment	100,200	55,018
Construction in progress	15,370	35,722
Total cost	124,649	99,819
Owned Properties | Hillsboro, Oregon
Real Estate Properties [Line Items]
Land	18,414
Buildings, Improvements and Equipment	21,088
Construction in progress	78,810	63,573
Total cost	118,312	63,573
Owned Properties | Sacramento, California
Real Estate Properties [Line Items]
Land	1,481	1,481
Buildings, Improvements and Equipment	65,595	65,258
Construction in progress	268	163
Total cost	67,344	66,902
Owned Properties | Dulles, Virginia
Real Estate Properties [Line Items]
Land	3,154	3,154
Buildings, Improvements and Equipment	51,913	48,651
Construction in progress	4,852	4,688
Total cost	59,919	56,493
Owned Properties | Manassas, Virginia
Real Estate Properties [Line Items]
Buildings, Improvements and Equipment	18
Construction in progress	58,990	57,662
Total cost	59,008	57,662
Owned Properties | Princeton, New Jersey
Real Estate Properties [Line Items]
Land	20,701	20,700
Buildings, Improvements and Equipment	35,225	35,192
Construction in progress	76	39
Total cost	56,002	55,931
Owned Properties | Eemshaven, Netherlands
Real Estate Properties [Line Items]
Construction in progress	55,084	37,267
Total cost	55,084	37,267
Owned Properties | Phoenix, Arizona
Real Estate Properties [Line Items]
Buildings, Improvements and Equipment		2,412
Construction in progress	32,927	31,840
Total cost	32,927	34,252
Owned Properties | Groningen, Netherlands
Real Estate Properties [Line Items]
Land	1,744	1,741
Buildings, Improvements and Equipment	9,858	9,085
Construction in progress	3,266	3,028
Total cost	14,868	13,854
Owned Properties | Other
Real Estate Properties [Line Items]
Land	2,213	2,213
Buildings, Improvements and Equipment	36,296	36,163
Construction in progress	797	120
Total cost	39,306	38,496
Leased Properties
Real Estate Properties [Line Items]
Buildings, Improvements and Equipment	84,550	82,813
Construction in progress	2,110	666
Total cost	$ 86,660	$ 83,479
Number of facilities leased | facility	7	7