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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] The following table presents the changes in Accumulated other comprehensive income (loss), excluding noncontrolling interests:
 
 
Foreign Currency Translation Adjustment and Other
 
Unrealized Gain (loss) on Investment Securities, Net
 
Unrealized Gain (Loss) on Interest Rate Swaps Designated as Cash Flow Hedges, Net
 
Employee Benefit Plan Items, Net
 
Total
Balance as of December 31, 2016
 
$
(348,241
)
 
$
6,094

 
$
(2,947
)
 
$
(38,445
)
 
$
(383,539
)
Other comprehensive income (loss) before reclassifications (a)
 
253,066

 
8,852

 
(2,870
)
 
(3,812
)
 
255,236

Amounts reclassified into income (loss)
 
(9,756
)
 
—

 
511

 
12,665

 
3,420

Net change in accumulated other comprehensive income (loss) for the year ended December 31, 2017
 
243,310

 
8,852

 
(2,359
)
 
8,853

 
258,656

Balance as of December 31, 2017
 
(104,931
)
 
14,946

 
(5,306
)
 
(29,592
)
 
(124,883
)
Reclassification to Retained Earnings (b)

 
—

 
(14,946
)
 
(1,185
)
 
(6,223
)
 
(22,354
)
Other comprehensive income (loss) before reclassifications (a)
 
(161,359
)
 
—

 
—

 
4,939

 
(156,420
)
Amounts reclassified into income (loss)
 
(37
)
 
—

 
931

 
3,314

 
4,208

Net change in accumulated other comprehensive income (loss) for the year ended December 31, 2018
 
(161,396
)
 
(14,946
)
 
(254
)
 
2,030

 
(174,566
)
Balance as of December 31, 2018
 
$
(266,327
)
 
$
—

 
$
(5,560
)
 
$
(27,562
)
 
$
(299,449
)

(a)
Foreign currency translation adjustment includes intra-entity foreign currency transactions that are of a long-term investment nature of $11,712 and $(64,610) for 2018 and 2017, respectively.
(b)
Amount relates to unrealized gains and losses on investments and stranded tax effects reclassified from "Accumulated other comprehensive income" to "Retained earnings" in accordance with ASU No. 2018-02 and ASU No. 2016-01 (Note 1).

Schedule of Stock by Class [Table Text Block] The following table sets forth the activity in the number of shares outstanding (in thousands):
 
 
Common Stock Issued
 
Treasury Stock
 
Common Stock Outstanding
Common stock outstanding at December 31, 2015
 
125,424

 
34,501

 
90,923

Shares issued for stock-based compensation awards
 
—

 
(1,372
)
 
1,372

Repurchases of common stock
 
—

 
3,382

 
(3,382
)
Common stock outstanding at December 31, 2016
 
125,424

 
36,511

 
88,913

Shares issued for stock-based compensation awards
 
—

 
(1,097
)
 
1,097

Repurchases of common stock
 
—

 
2,319

 
(2,319
)
Common stock outstanding at December 31, 2017
 
125,424

 
37,733

 
87,691

Shares issued for stock-based compensation awards
 
—

 
(709
)
 
709

Repurchases of common stock
 
—

 
3,209

 
(3,209
)
Common stock outstanding at December 31, 2018
 
125,424

 
40,233

 
85,191
Share-Repurchase Programs [Table Text Block] The following table shows the company's Board of Directors (the "Board") approved share-repurchase programs as of December 31, 2018:
Month of Board Approval
 
Dollar Value Approved for Repurchase
 
Dollar Value of Shares Repurchased
 
Approximate
Dollar Value of
Shares that May
Yet be
Purchased
Under the
Program
December 2016
 
$
400,000

 
$
271,388

 
$
128,612

December 2018
 
600,000

 
—

 
600,000

Total
 
$
1,000,000

 
$
271,388

 
$
728,612