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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
Financial assets and liabilities measured at fair value on a recurring basis in the consolidated financial statements as of June 30, 2015 and December 31, 2014 are summarized by type of inputs applicable to the fair value measurements as follows:

June 30, 2015
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Marketable securities (a)
$
74,808

 
$
10,675

 
$
35,016

 
$
120,499

Long-term investments (a)
265,115

 
—

 
3,907

 
269,022

Investments in certain funds
—

 
—

 
468

 
468

Precious metal and commodity inventories recorded at fair value
13,195

 
—

 
—

 
13,195

Commodity contracts on precious metal and commodity inventories
—

 
846

 
—

 
846

Foreign currency forward exchange contracts
—

 
2,331

 
—

 
2,331

Total
$
353,118

 
$
13,852

 
$
39,391

 
$
406,361

 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
Financial instruments
$
21,385

 
$
—

 
$
—

 
$
21,385

Interest rate swap agreement
—

 
(103
)
 
—

 
(103
)
Total
$
21,385

 
$
(103
)
 
$
—

 
$
21,282

December 31, 2014
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Marketable securities (a)
$
93,768

 
$
10,793

 
$
33,896

 
$
138,457

Long-term investments (a)
286,740

 
—

 
13,985

 
300,725

Investments in certain funds
—

 
—

 
525

 
525

Precious metal and commodity inventories recorded at fair value
13,249

 
—

 
—

 
13,249

Commodity contracts on precious metal and commodity inventories
764

 
—

 
—

 
764

Total
$
394,521

 
$
10,793

 
$
48,406

 
$
453,720

 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
Financial instruments
$
21,311

 
$
—

 
$
—

 
$
21,311

Interest rate swap agreement
—

 
138

 
—

 
138

Total
$
21,311

 
$
138

 
$
—

 
$
21,449

(a) For additional detail of the marketable securities and long-term investments see Note 4 - "Investments."

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Following is a summary of changes in financial assets measured using Level 3 inputs:
 
Investments in Associated Companies
 
Other Investments - Related Party
 
ModusLink Warrants
 
Marketable Securities and Other
 
Total
Assets
 
 
 
 
 
 
 
 
 
Balance at March 31, 2014
$
2,131

 
$
10,226

 
$
3,385

 
$
30,391

 
$
46,133

Purchases
—

 
—

 
—

 
5,239

 
5,239

Sales
—

 
(1,496
)
 
—

 
(2,758
)
 
(4,254
)
Realized loss on sale
 
 
 
 
 
 
(129
)
 
(129
)
Unrealized gains
—

 
1,478

 
—

 
—

 
1,478

Unrealized losses
(51
)
 
(3
)
 
(951
)
 
(397
)
 
(1,402
)
Balance at June 30, 2014
$
2,080

 
$
10,205

 
$
2,434

 
$
32,346

 
$
47,065

 
 
 
 
 
 
 
 
 
 
Balance at March 31, 2015
$
2,298

 
$
7,296

 
$
2,163

 
$
31,373

 
$
43,130

Purchases
—

 
—

 
—

 
5,108

 
5,108

Sales
—

 
(7,258
)
 
—

 
(359
)
 
(7,617
)
Realized gain on sale
—

 
—

 
—

 
—

 
—

Unrealized gains
—

 
—

 
—

 
—

 
—

Unrealized losses
(27
)
 
(38
)
 
(527
)
 
(638
)
 
(1,230
)
Balance at June 30, 2015
$
2,271

 
$
—

 
$
1,636

 
$
35,484

 
$
39,391


 
Long - Term Investments
 
 
 
 
 
Investments in Associated Companies (a)
 
Other Investments - Related Party (b)
 
ModusLink Warrants (c)
 
Marketable Securities and Other (d)
 
Total
Assets
 
 
 
 
 
 
 
 
 
Balance at December 31, 2013
$
2,243

 
$
10,228

 
$
5,832

 
$
24,209

 
$
42,512

Purchases
—

 
—

 
—

 
10,538

 
10,538

Sales
—

 
(1,496
)
 
—

 
(4,732
)
 
(6,228
)
Realized loss on sale
—

 
—

 
—

 
(129
)
 
(129
)
Unrealized gains
—

 
1,476

 
—

 
2,460

 
3,936

Unrealized losses
(163
)
 
(3
)
 
(3,398
)
 
—

 
(3,564
)
Balance at June 30, 2014
$
2,080

 
$
10,205

 
$
2,434

 
$
32,346

 
$
47,065

 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2014
$
2,163

 
$
9,623

 
$
2,199

 
$
34,421

 
$
48,406

Purchases
—

 
—

 
—

 
5,108

 
5,108

Sales
—

 
(9,985
)
 
—

 
(522
)
 
(10,507
)
Realized gain on sale
—

 
—

 
—

 
—

 
—

Unrealized gains
135

 
484

 
—

 
—

 
619

Unrealized losses
(27
)
 
(122
)
 
(563
)
 
(3,523
)
 
(4,235
)
Balance at June 30, 2015
$
2,271

 
$
—

 
$
1,636

 
$
35,484

 
$
39,391


(a) Unrealized losses are recorded in (Loss) Income of associated companies, net of taxes in the Company's Consolidated Statements of Operations.
(b) Unrealized gains and losses are recorded in (Loss) Income from other investments-related party in the Company's Consolidated Statements of Operations.
(c) Unrealized gains and losses are recorded in (Loss) Income from investments held at fair value in the Company's Consolidated Statements of Operations.
(d) Realized gains on sale are recorded in Other income, net in the Company's Consolidated Statements of Operations.