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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Incentive Plan - Summary of Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Units
Granted (shares)	128,049	120,368	128,986
Restricted stock
Units
Unvested beginning of period (shares)	372,792
Vested (shares)	(385,905)
Cancelled or expired (shares)	(35,274)
Unvested end of period (shares)	783,219	372,792
Weighted-Average Grant Date Fair Value
Unvested, beginning of period (in dollars per share)	$ 108.47
Granted (in dollars per share)	138.82	$ 115.25	$ 100.33
Vested (in dollars per share)	116.19
Cancelled or expired (in dollars per share)	120.31
Unvested, end of period (in dollars per share)	$ 123.04	$ 108.47
Weighted-Average Remaining Contractual Life (Years)	2 years 3 months 10 days
Aggregate Intrinsic Value	$ 108,797
Award vesting period	4 years
Intrinsic value of units	$ 53,400	$ 14,000	$ 10,000
Restricted stock \| Interxion Holding N.V.
Units
Granted (shares)	831,606
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 126.43
Interxion awards
Units
Granted (shares)	567,810
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 120.67