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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Available-for-Sale Short-Term Investments
Our available-for-sale short-term investments are as follows (in thousands):
 
Amortized Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair value
As of December 31, 2018
 
 
 
 
 
 
 
U.S. Government and sponsored entities
$
50,329

 
$
—

 
$
—

 
$
50,329

Corporate debt securities
47,434

 
—

 
—

 
47,434

Municipal securities
379

 
—

 
—

 
379

Asset-backed securities
4,091

 
—

 
—

 
4,091

Mortgage-backed securities – residential
116

 
—

 
—

 
116

Total short-term investments
$
102,349

 
$
—

 
$
—

 
$
102,349

 
 
 
 
 
 
 
 
As of 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
Summary of Fair Value and Duration of Investments, Including Cash Equivalents, that have been Classified in Gross Unrealized Loss Position
The fair value and duration of the available for sale short term investments that are in a gross unrealized loss position are as follows (in thousands): 
 
Less than 12 Months
 
More than 12 Months
 
Total
As of December 31, 2017
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
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 are summarized by maturity date as follows (in thousands): 
 
As of December 31, 2018
 
Amortized cost
 
Fair value
Mature in less than one year
$
70,811

 
$
70,811

Mature in one to three years
31,538

 
31,538

Total short-term investments
$
102,349

 
$
102,349
Investments in Accordance with Fair Value Hierarchy
Our investments and liabilities measured at fair value have been presented in accordance with the fair value hierarchy specified in ASC 820 in order of liquidity as follows (in thousands): 
 
As of December 31, 2018
 
As of December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
$
28,715

 
$
—

 
$
—

 
$
28,715

 
$
9,897

 
$
—

 
$
—

 
$
9,897

U.S. Government and sponsored entities
28,885

 
21,444

 
—

 
50,329

 
33,261

 
25,903

 
—

 
59,164

Corporate debt securities
—

 
47,434

 
—

 
47,434

 
—

 
78,906

 
—

 
78,906

Municipal securities
—

 
379

 
—

 
379

 
—

 
380

 
—

 
380

Asset-backed securities
—

 
4,036

 
55

 
4,091

 
—

 
9,754

 
51

 
9,805

Mortgage-backed securities—residential
—

 
116

 
—

 
116

 
—

 
442

 
—

 
442

Total Assets
$
57,600

 
$
73,409

 
$
55

 
$
131,064

 
$
43,158

 
$
115,385

 
$
51

 
$
158,594

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Contingent consideration, current and noncurrent
$
—

 
$
—

 
$
10,501

 
$
10,501

 
$
—

 
$
—

 
$
35,702

 
$
35,702

Self-insurance
—

 
—

 
840

 
840

 
—

 
—

 
902

 
902

Total Liabilities
$
—

 
$
—

 
$
11,341

 
$
11,341

 
$
—

 
$
—

 
$
36,604

 
$
36,604
Contingent consideration rollforward
Changes in the fair value of the contingent consideration liability are summarized as follows (in thousands):
Fair value of contingent consideration at December 31, 2016
$
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
6,472

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

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

Escrow adjustment
(200
)
Changes in valuation
(21,486
)
Payments and settlements
(3,193
)
Foreign currency adjustment
(322
)
Fair value of contingent consideration at December 31, 2018
$
10,501