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Balance Sheet Components (Tables)
 12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Cash, Cash Equivalents and Short-Term and Long-Term Investments
Cash, cash equivalents and short-term and long-term investments consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Cash and cash equivalents:
 
 
 
Cash (1)
$
486,648

 
$
985,382

Cash equivalents:
 
 
 
Money market funds
119,518

 
427,135

Total cash and cash equivalents
606,166

 
1,412,517

Short-term and long-term investments:
 
 
 
Certificates of deposit
2,823

 
31,351

Publicly traded equity securities
1,717

 
6,163

Total short-term and long-term investments
4,540

 
37,514

Total cash, cash equivalents and short-term and long-term investments
$
610,706

 
$
1,450,031

 
(1) 
Excludes restricted cash.
(2) 
Total unrealized gains on the publicly traded equity securities as of December 31, 2017 were insignificant. The changes in the fair values of publicly traded equity securities were recognized within other income (expense) in the Company's consolidated statements of operations as a result of the adoption of ASU 2016-01 on January 1, 2018.
Net Unrealized Gains (Losses) on Available-for-Sale Securities
The balance of certificates of deposits, by contractual maturity, as of December 31 (in thousands):
 
2018
 
2017
Due within one year
$
2,823

 
$
28,271

Due after one year through three years
—

 
3,080

Total
$
2,823

 
$
31,351
Accounts Receivable, Net
Accounts receivable, net, consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Accounts receivable
$
646,069

 
$
594,541

Allowance for doubtful accounts
(15,950
)
 
(18,228
)
Accounts receivable, net
$
630,119

 
$
576,313
Activities of Allowance for Doubtful Accounts
The following table summarizes the activity of the Company's allowance for doubtful accounts (in thousands):
Balance as of December 31, 2015
$
10,352

Provision for allowance for doubtful accounts
8,260

Net write-offs
(2,521
)
Impact of foreign currency exchange
(416
)
Balance as of December 31, 2016
15,675

Provision for allowance for doubtful accounts
5,627

Net write-offs
(4,546
)
Impact of foreign currency exchange
1,472

Balance as of December 31, 2017
18,228

Provision for allowance for doubtful accounts
7,236

Net write-offs
(8,396
)
Impact of foreign currency exchange
(1,118
)
Balance as of December 31, 2018
$
15,950
Other Current Assets
Other current assets consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Prepaid expenses
$
70,433

 
$
64,832

Taxes receivable
98,245

 
110,961

Restricted cash, current
10,887

 
26,919

Other receivables
12,611

 
7,797

Derivative instruments
62,170

 
4,175

Contract asset, current
9,778

 
—

Other current assets
10,733

 
17,343

Total other current assets
$
274,857

 
$
232,027
Property, Plant and Equipment, Net
The Company's estimated useful lives of its property, plant and equipment are as follows:
Core systems
3-25 years
Buildings
12-58 years
Leasehold improvements
12-40 years
Personal Property
3-10 years
Property, plant and equipment, net consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Core systems
$
7,073,912

 
$
6,334,702

Buildings
4,822,501

 
3,906,686

Leasehold improvements
1,637,133

 
1,850,351

Construction in progress
974,152

 
425,428

Personal property
857,585

 
798,133

Land
631,367

 
423,539

 
15,996,650

 
13,738,839

Less accumulated depreciation
(4,970,630
)
 
(4,344,237
)
Property, plant and equipment, net
$
11,026,020

 
$
9,394,602
Goodwill and Other Intangible Assets
The following table presents goodwill and other intangible assets, net, for the years ended December 31, 2018 and 2017 (in thousands):
 
2018
 
2017
Goodwill:
 
 
 
Americas
$
1,745,804

 
$
1,561,512

EMEA
2,474,164

 
2,610,899

Asia-Pacific
616,420

 
239,351

 
$
4,836,388

 
$
4,411,762

Intangible assets, net:
 
 
 
Intangible assets - customer relationships
$
2,733,864

 
$
2,673,886

Intangible assets - trade names
71,778

 
73,295

Intangible assets - favorable leases
35,969

 
37,913

Intangible assets - in-place leases
33,671

 
10,327

Intangible assets - licenses
9,697

 
9,696

 
2,884,979

 
2,805,117

Accumulated amortization - customer relationships
(467,111
)
 
(331,930
)
Accumulated amortization - trade names
(62,585
)
 
(71,728
)
Accumulated amortization - favorable leases
(9,986
)
 
(9,607
)
Accumulated amortization - in-place leases
(8,118
)
 
(3,644
)
Accumulated amortization - licenses
(3,883
)
 
(3,236
)
 
(551,683
)
 
(420,145
)
Total intangible assets, net
$
2,333,296

 
$
2,384,972
Carrying Amount of Goodwill by Geographic Regions
Changes in the carrying amount of goodwill by geographic regions are as follows (in thousands):
 
Americas
 
EMEA
 
Asia-Pacific
 
Total
Balance as of December 31, 2016
$
469,438

 
$
2,281,306

 
$
235,320

 
$
2,986,064

Purchase accounting adjustments - Verizon Data Center acquisition
1,095,262

 
—

 
—

 
1,095,262

Purchase accounting adjustments - Other 2017 acquisitions
—

 
163,993

 
—

 
163,993

Impact of foreign currency exchange
(3,188
)
 
165,600

 
4,031

 
166,443

Balance as of December 31, 2017
1,561,512

 
2,610,899

 
239,351

 
4,411,762

Purchase accounting adjustments - Infomart Dallas acquisition
197,378

 
—

 
—

 
197,378

Purchase accounting adjustments - Metronode acquisition
—

 
—

 
413,871

 
413,871

Purchase accounting adjustments - Other acquisitions
333

 
1,357

 
—

 
1,690

Impact of foreign currency exchange
(13,419
)
 
(138,092
)
 
(36,802
)
 
(188,313
)
Balance as of December 31, 2018
$
1,745,804

 
$
2,474,164

 
$
616,420

 
$
4,836,388
Net Book Value of Intangible Assets by Geographic Regions
Changes in the net book value of intangible assets by geographic regions are as follows (in thousands):
 
Americas
 
EMEA
 
Asia-Pacific
 
Total
Balance as of December 31, 2015
$
50,643

 
$
44,355

 
$
129,567

 
$
224,565

TelecityGroup acquisition
—

 
694,243

 
—

 
694,243

Paris IBX Data Center acquisition
—

 
11,758

 
—

 
11,758

Sale of Terra Power
—

 
—

 
(2,460
)
 
(2,460
)
Write-off of intangible asset
(573
)
 
—

 
—

 
(573
)
Amortization of intangibles
(11,348
)
 
(97,715
)
 
(13,799
)
 
(122,862
)
Impact of foreign currency exchange
1,395

 
(90,280
)
 
3,445

 
(85,440
)
Balance as of December 31, 2016
40,117

 
562,361

 
116,753

 
719,231

Verizon Data Center acquisition
1,693,900

 
—

 
—

 
1,693,900

Other 2017 acquisitions
—

 
112,645

 
—

 
112,645

Write-off of intangible asset
—

 
(725
)
 
—

 
(725
)
Amortization of intangibles
(84,749
)
 
(79,105
)
 
(13,154
)
 
(177,008
)
Impact of foreign currency exchange
(2,895
)
 
36,043

 
3,781

 
36,929

Balance as of December 31, 2017
1,646,373

 
631,219

 
107,380

 
2,384,972

Infomart Dallas acquisition
65,847

 
—

 
—

 
65,847

Metronode acquisition
—

 
—

 
128,229

 
128,229

Other acquisitions
—

 
8,342

 
—

 
8,342

Write-off of intangible asset
(334
)
 
(1,661
)
 
(3
)
 
(1,998
)
Amortization of intangibles
(125,683
)
 
(62,283
)
 
(15,450
)
 
(203,416
)
Impact of foreign currency exchange
(7,232
)
 
(31,757
)
 
(9,691
)
 
(48,680
)
Balance as of December 31, 2018
$
1,578,971

 
$
543,860

 
$
210,465

 
$
2,333,296
Estimated Future Amortization Expense Related to Intangibles
Estimated future amortization expense related to these intangibles is as follows (in thousands):
Years ending:
 
2019
$
199,862

2020
193,073

2021
185,332

2022
181,211

2023
180,883

Thereafter
1,392,935

Total
$
2,333,296
Other Assets
Other assets consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Deferred tax assets, net
$
58,300

 
$
66,031

Prepaid expenses
125,158

 
89,784

Debt issuance costs, net
8,532

 
10,670

Deposits
54,986

 
48,296

Restricted cash
10,551

 
11,265

Derivative instruments
10,904

 
4,110

Contract assets, non-current
16,396

 
—

Contract costs
188,200

 
—

Other assets
60,225

 
11,594

Total other assets
$
533,252

 
$
241,750
Accounts Payable and Accrued Expenses
Accounts payable and accrued expenses consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Accounts payable
$
96,980

 
$
101,744

Accrued compensation and benefits
235,697

 
214,585

Accrued interest
126,142

 
100,347

Accrued taxes(1)
118,818

 
130,272

Accrued utilities and security
78,547

 
68,916

Accrued professional fees
17,010

 
13,830

Accrued repairs and maintenance
10,736

 
11,232

Accrued other
72,762

 
78,331

Total accounts payable and accrued expenses
$
756,692

 
$
719,257

 

(1) 
Includes income taxes payable of $67.9 million and $56.4 million, respectively, as of December 31, 2018 and 2017.
Other Current Liabilities
Other current liabilities consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Deferred revenue, current
$
73,143

 
$
87,300

Customer deposits
20,430

 
16,598

Derivative instruments
8,812

 
34,466

Deferred rent
6,466

 
6,546

Dividends payable
8,795

 
11,181

Asset retirement obligations
6,776

 
1,716

Other current liabilities
2,573

 
2,107

Total other current liabilities
$
126,995

 
$
159,914
Other Liabilities
Other liabilities consisted of the following as of December 31 (in thousands):
 
2018
 
2017
Asset retirement obligations
$
89,887

 
$
96,823

Deferred tax liabilities, net
247,849

 
252,287

Deferred revenue, non-current
46,641

 
121,257

Deferred rent
108,693

 
97,782

Accrued taxes
116,735

 
64,378

Dividends payable
6,545

 
6,669

Customer deposits
9,671

 
10,849

Derivative instruments
928

 
6,381

Other liabilities
2,814

 
5,284

Total other liabilities
$
629,763

 
$
661,710
Summary of Asset Retirement Obligation Liability
The following table summarizes the activities of the Company's asset retirement obligation ("ARO") (in thousands):
Asset retirement obligations as of December 31, 2015
$
78,482

Additions
22,955

Adjustments (1)
(2,366
)
Accretion expense
6,685

Impact of foreign currency exchange
(2,741
)
Asset retirement obligations as of December 31, 2016
103,015

Additions
17,736

Adjustments (1)
(34,576
)
Accretion expense
7,335

Impact of foreign currency exchange
5,029

Asset retirement obligations as of December 31, 2017
98,539

Additions
5,126

Adjustments (1)
(11,288
)
Accretion expense
6,285

Impact of foreign currency exchange
(1,999
)
Asset retirement obligations as of December 31, 2018
$
96,663

 
(1) 
The ARO adjustments are primarily due to lease amendments and acquisition of real estate assets, as well as other adjustments.