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Investment in Unconsolidated Joint Venture - Additional Information (Details) € in Thousands, $ in Thousands	1 Months Ended							12 Months Ended
	May 31, 2017 USD ($)	May 31, 2017 EUR (€)	Jun. 30, 2016 EUR (€)	Feb. 28, 2015 USD ($)	Feb. 28, 2015 EUR (€)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)	Jan. 31, 2015 USD ($)	Jan. 31, 2015 EUR (€)	Sep. 30, 2014 EUR (€)
Schedule of Equity Method Investments [Line Items]
Initial funding for equity method investment								$ 726	$ 362	$ 3,929
KBCD Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Initial funding for equity method investment						$ 39,477	€ 30,724
Wholly-owned subsidiary [Member] | Champ Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)						59.00%		0.00%			0.00%			59.00%
Champ LP [Member] | KBC Bank Deutschland AG [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)						35.00%								35.00%
Company and affiliated investors ownership, percentage								100.00%			100.00%
Commitment to Invest in KBCD [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest						$ 50,000								€ 38,000
Unfunded Commitment, Champ L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest			€ 2,802					$ 2,985			€ 2,802
Other commitment, commitment transfer | €			€ 427
Champ LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest				48.00%	48.00%
Proceeds from sale of equity method investments	$ 24,498	€ 21,792		$ 20,794	€ 16,314
Foreign exchange adjustments included in other comprehensive loss				$ 2,614
Loss on disposal of equity method investment	$ 3,305
Champ LP [Member] | Additional Investment [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest												$ 3,929	€ 3,331

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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