Financial Information by Segment & Geographic Area - Schedule of Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 322,428	$ 370,195	$ 399,016	$ 384,714	$ 385,964	$ 393,954	$ 391,586	$ 406,699	$ 1,476,353	$ 1,578,203	$ 1,328,297
Long lived tangible assets	561,585				483,534				561,585	483,534
Subtotal Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Long lived tangible assets	169,681				179,539				169,681	179,539
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									593,769	628,709	524,065
Long lived tangible assets	81,388				104,823				81,388	104,823
Sweden
Revenues from External Customers and Long-Lived Assets [Line Items]
Long lived tangible assets	26,419				26,351				26,419	26,351
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Long lived tangible assets	43,547				29,586				43,547	29,586
Poland
Revenues from External Customers and Long-Lived Assets [Line Items]
Long lived tangible assets	12,148				12,964				12,148	12,964
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									10,964	16,628	12,496
Long lived tangible assets	6,179				5,815				6,179	5,815
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									394,349	401,935	330,424
Long lived tangible assets	220,200				139,929				220,200	139,929
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									241,235	279,016	246,551
Long lived tangible assets	112,303				115,036				112,303	115,036
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									94,541	95,611	80,143
Long lived tangible assets	23,662				21,395				23,662	21,395
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									63,149	75,638	64,645
Long lived tangible assets	19,655				10,719				19,655	10,719
South Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									54,746	56,373	46,844
Long lived tangible assets	15,983				16,894				15,983	16,894
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									23,601	24,293	$ 23,129
Long lived tangible assets	$ 100				$ 22				$ 100	$ 22