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Investments and Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Schedule of Investments
We monitor the concentration, diversification, maturity, and liquidity of our investment portfolio, which is primarily invested in fixed-income securities, and classify our investment portfolio as shown below:
 
 
 
As of March 31
 
As of December 31
($000)
 
2013

 
2012

Available-for-sale
 
$
70,193

 
$
125,786

Held-to-maturity
 
26,408

 
26,357

Trading securities
 
6,835

 
5,386

Total
 
$
103,436

 
$
157,529
Unrealized Gain (Loss) on Investments
The following table shows the cost, unrealized gains (losses), and fair values related to investments classified as available-for-sale and held-to-maturity:
 
 
 
As of March 31, 2013
 
As of December 31, 2012
($000)
 
Cost

 
Unrealized
Gain

 
Unrealized
Loss

 
Fair
Value

 
Cost

 
Unrealized
Gain

 
Unrealized
Loss

 
Fair
Value

Available-for-sale:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Government obligations
 
$
17,384

 
$
27

 
$
(108
)
 
$
17,303

 
$
40,669

 
$
29

 
$
(608
)
 
$
40,090

Corporate bonds
 
30,171

 
18

 
(186
)
 
30,003

 
49,339

 
36

 
(292
)
 
49,083

Foreign obligations
 
2,433

 
1

 
(30
)
 
2,404

 
2,437

 
1

 
(19
)
 
2,419

Commercial paper
 
—

 
—

 
—

 
—

 
2,000

 
—

 
—

 
2,000

Equity securities and exchange-traded funds
 
7,351

 
943

 
(164
)
 
8,130

 
19,613

 
1,359

 
(323
)
 
20,649

Mutual funds
 
10,523

 
1,956

 
(126
)
 
12,353

 
10,499

 
1,092

 
(46
)
 
11,545

Total
 
$
67,862

 
$
2,945

 
$
(614
)
 
$
70,193

 
$
124,557

 
$
2,517

 
$
(1,288
)
 
$
125,786

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Certificates of deposit
 
$
26,408

 
$
—

 
$
—

 
$
26,408

 
$
26,357

 
$
—

 
$
—

 
$
26,357
Investments Classified by Contractual Maturity Date
The expected maturities of certain fixed-income securities may differ from their contractual maturities because some of these holdings have call features that allow the issuers the right to prepay obligations without penalties.
 
 
 
As of March 31, 2013
 
As of December 31, 2012
($000)
 
Cost

 
Fair Value

 
Cost

 
Fair Value

Available-for-sale:
 
 

 
 

 
 

 
 

Due in one year or less
 
$
49,988

 
$
49,710

 
$
87,599

 
$
86,784

Due in one to two years
 
—

 
—

 
6,846

 
6,808

Equity securities, exchange-traded funds, and mutual funds
 
17,874

 
20,483

 
30,112

 
32,194

    Total
 
$
67,862

 
$
70,193

 
$
124,557

 
$
125,786

 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 

 
 

 
 

 
 

Due in one year or less
 
$
26,403

 
$
26,403

 
$
26,352

 
$
26,352

Due in one to three years
 
5

 
5

 
5

 
5

Total
 
$
26,408

 
$
26,408

 
$
26,357

 
$
26,357
Schedule of Realized Gain (Loss) on Available-For-Sale Securities

The following table shows the realized gains and losses arising from sales of our investments classified as available-for-sale recorded in our Condensed Consolidated Statements of Income: 
 
 
Three months ended March 31
($000)
 
2013

 
2012

Realized gains
 
$
1,564

 
$
212

Realized losses
 
(839
)
 
(298
)
Realized gains (losses), net
 
$
725

 
$
(86
)
Unrealized Gain (Loss) On Trading Securities

The following table shows the net unrealized gains (losses) on trading securities as recorded in our Condensed Consolidated Statements of Income:
 
 
 
Three months ended March 31
($000)
 
2013

 
2012

Unrealized gains, net
 
$
318

 
$
428
Fair Value, Assets Measured on Recurring Basis

The fair value of our assets subject to fair value measurements and that are measured at fair value on a recurring basis using the fair value hierarchy and the necessary disclosures under FASB ASC 820, Fair Value Measurement, are as follows:
 
 
 
Fair Value
 
Fair Value Measurements as of March 31, 2013
 
 
as of
 
Using Fair Value Hierarchy
($000)
 
March 31, 2013
 
Level 1

 
Level 2

 
Level 3

Available-for-sale investments:
 
 

 
 

 
 

 
 

Government obligations
 
$
17,303

 
$
—

 
$
17,303

 
$
—

Corporate bonds
 
30,003

 
—

 
30,003

 
—

Foreign obligations
 
2,404

 
—

 
2,404

 
—

Equity securities and exchange-traded funds
 
8,130

 
8,130

 
—

 
—

Mutual funds
 
12,353

 
12,353

 
—

 
—

Trading securities
 
6,835

 
6,835

 
—

 
—

Cash equivalents
 
9,285

 
9,285

 
—

 
—

Total
 
$
86,313

 
$
36,603

 
$
49,710

 
$
—

 
 
 
Fair Value
 
Fair Value Measurements as of December 31, 2012
 
 
as of
 
Using Fair Value Hierarchy
($000)
 
December 31, 2012
 
Level 1

 
Level 2

 
Level 3

Available-for-sale investments:
 
 

 
 

 
 

 
 

Government obligations
 
$
40,090

 
$
—

 
$
40,090

 
$
—

Corporate bonds
 
49,083

 
—

 
49,083

 
—

Foreign obligations
 
2,419

 
—

 
2,419

 
—

Commercial paper
 
2,000

 
—

 
2,000

 
—

Equity securities and exchange-traded funds
 
20,649

 
20,649

 
—

 
—

Mutual funds
 
11,545

 
11,545

 
—

 
—

Trading securities
 
5,386

 
5,386

 
—

 
—

Cash equivalents
 
398

 
398

 
—

 
—

Total
 
$
131,570

 
$
37,978

 
$
93,592

 
$
—