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Other Comprehensive Income (Loss) and Related Tax Effects Other Comprehensive Income (Loss) and Related Tax Effects (Tables)
 9 Months Ended
Sep. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]  
The changes in the balances of Accumulated other comprehensive loss by component were as follows:
 
 
Cumulative Foreign Currency Translation Losses
 
Unrealized Gain (Loss) On Available-For-Sale Securities
 
Accumulated Other Comprehensive Loss
 
 
(In thousands)
Balance, December 31, 2016
 
$
(59,038
)
 
$
(1,681
)
 
$
(60,719
)
Other comprehensive income (loss) before reclassifications
 
13,956

 
(1,577
)
 
12,379

Amounts reclassified to net income
 
—

 
3,298

 
3,298

Other comprehensive income
 
13,956

 
1,721

 
15,677

Balance, September 30, 2017
 
$
(45,082
)
 
$
40

 
$
(45,042
)
 
 
 
 
 
 
 
Balance, December 31, 2017
 
$
(52,251
)
 
$
(571
)
 
$
(52,822
)
Cumulative effect of adoption of ASU No. 2016-01 as of January 1, 2018 (Note 2)
 
—

 
433

 
433

Balance, January 1, 2018
 
(52,251
)
 
(138
)
 
(52,389
)
Other comprehensive loss before reclassifications
 
(38,485
)
 
(199
)
 
(38,684
)
Amounts reclassified to net income
 
—

 
(4
)
 
(4
)
Other comprehensive loss
 
(38,485
)
 
(203
)
 
(38,688
)
Balance, September 30, 2018
 
$
(90,736
)
 
$
(341
)
 
$
(91,077
)