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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Available-for-Sale Short-Term Investments
Our available-for-sale short-term investments are summarized as follows (in thousands):
 
Amortized cost
 
Gross unrealized
gains
 
Gross unrealized
losses
 
Fair value
June 30, 2018
 
 
 
 
 
 
 
U.S. Government and sponsored entities
$
59,822

 
$
—

 
$
(773
)
 
$
59,049

Corporate debt securities
66,529

 
—

 
(662
)
 
65,867

Municipal securities
382

 
—

 
(3
)
 
379

Asset-backed securities
8,545

 
35

 
(77
)
 
8,503

Mortgage-backed securities – residential
210

 
—

 
(2
)
 
208

Total short-term investments
$
135,488

 
$
35

 
$
(1,517
)
 
$
134,006

December 31, 2017
 
 
 
 
 
 
 
U.S. Government and sponsored entities
$
59,824

 
$
—

 
$
(660
)
 
$
59,164

Corporate debt securities
79,356

 
—

 
(450
)
 
78,906

Municipal securities
382

 
—

 
(2
)
 
380

Asset-backed securities
9,808

 
44

 
(47
)
 
9,805

Mortgage-backed securities – residential
445

 
—

 
(3
)
 
442

Total short-term investments
$
149,815

 
$
44

 
$
(1,162
)
 
$
148,697


The fair value and duration that investments, including cash equivalents, have been in a gross unrealized loss position below are as follows (in thousands):
 
Less than 12 Months
 
More than 12 Months
 
Total
  
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and sponsored entities
$
22,889

 
$
(346
)
 
$
36,008

 
$
(427
)
 
$
58,897

 
$
(773
)
Corporate debt securities
32,229

 
(349
)
 
33,293

 
(313
)
 
65,522

 
(662
)
Municipal securities
377

 
(3
)
 
—

 
—

 
377

 
(3
)
Asset-backed securities
4,302

 
(56
)
 
4,134

 
(21
)
 
8,436

 
(77
)
Mortgage-backed securities – residential
11

 
—

 
160

 
(2
)
 
171

 
(2
)
Total
$
59,808

 
$
(754
)
 
$
73,595

 
$
(763
)
 
$
133,403

 
$
(1,517
)
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and sponsored entities
$
23,023

 
$
(206
)
 
$
35,989

 
$
(454
)
 
$
59,012

 
$
(660
)
Corporate debt securities
45,857

 
(207
)
 
32,634

 
(243
)
 
78,491

 
(450
)
Municipal securities
378

 
(2
)
 
—

 
—

 
378

 
(2
)
Asset-backed securities
6,779

 
(31
)
 
2,947

 
(16
)
 
9,726

 
(47
)
Mortgage-backed securities – residential
162

 
(2
)
 
142

 
(1
)
 
304

 
(3
)
Total
$
76,199

 
$
(448
)
 
$
71,712

 
$
(714
)
 
$
147,911

 
$
(1,162
)
Amortized Cost and Estimated Fair Value of Investments
Amortized cost and estimated fair value of investments as of June 30, 2018, are summarized as follows (in thousands):
 
Amortized cost
 
Fair value
Mature in less than one year
$
78,377

 
$
77,843

Mature in one to three years
57,111

 
56,163

Total short-term investments
$
135,488

 
$
134,006
Investments in Accordance with Fair Value Hierarchy
Our assets and liabilities measured at fair value by levels within the fair value hierarchy are summarized as follows (in thousands):
 
June 30, 2018
 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
$
1,017

 
$
—

 
$
—

 
$
1,017

 
$
9,897

 
$
—

 
$
—

 
$
9,897

U.S. Government and sponsored
 entities
33,207

 
25,842

 
—

 
59,049

 
33,261

 
25,903

 
—

 
59,164

Corporate debt securities
—

 
65,867

 
—

 
65,867

 
—

 
78,906

 
—

 
78,906

Municipal securities
—

 
378

 
—

 
378

 
—

 
380

 
—

 
380

Asset-backed securities
—

 
8,462

 
43

 
8,505

 
—

 
9,754

 
51

 
9,805

Mortgage-backed securities
 – residential
—

 
208

 
—

 
208

 
—

 
442

 
—

 
442

 
$
34,224

 
$
100,757

 
$
43

 
$
135,024

 
$
43,158

 
$
115,385

 
$
51

 
$
158,594

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Contingent consideration,
 current and noncurrent
$
—

 
$
—

 
$
22,129

 
$
22,129

 
$
—

 
$
—

 
$
35,702

 
$
35,702

Self-insurance
—

 
—

 
969

 
969

 
—

 
—

 
902

 
902

 
$
—

 
$
—

 
$
23,098

 
$
23,098

 
$
—

 
$
—

 
$
36,604

 
$
36,604
Summary of Changes in Fair Value Contingent Consideration
Changes in the fair value of contingent consideration are summarized as follows (in thousands):
Fair value of contingent consideration as of January 1, 2017
$
56,463

Fair value of Generation Digital contingent consideration at August 14, 2017
3,600

Fair value of Escada contingent consideration at October 1, 2017
2,049

Escrow adjustment for Reggiani acquisition
(4,711
)
Changes in valuation
4,761

Earnout accretion
1,711

Payments and settlements
(30,924
)
Foreign currency adjustment
2,753

Fair value of contingent consideration at December 31, 2017
$
35,702

Changes in valuation
(12,775
)
Earnout accretion
104

Payments
(751
)
Foreign currency adjustment
(151
)
Fair value of contingent consideration as of June 30, 2018
$
22,129