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Stockholders' Equity (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
Stockholders' Equity (Details Textual) - USD ($)	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Feb. 26, 2020	Mar. 18, 2019	Mar. 11, 2019
Equity, Class of Treasury Stock [Line Items]
Weighted average common shares outstanding	1,239,000	2,533,000	2,429,000	1,608,000
Conversion price						$ 188.73
Market price	$ 135.35	$ 95.82	$ 135.35	$ 95.82
Foreign currency translation gain	$ 12,700	$ 32,200,000	$ 30,200	$ 27,600,000
Stock repurchase program, authorized amount	$ 0		$ 0
Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized					5,000,000.0
Stock repurchase program, authorized amount					$ 250,000,000		$ 120,000,000