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Unconsolidated Joint Venture - Additional Information (Details) € in Thousands, $ in Thousands	1 Months Ended					12 Months Ended
	Jun. 30, 2016 EUR (€)	Feb. 28, 2015 USD ($)	Feb. 28, 2015 EUR (€)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 EUR (€)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 EUR (€)	Jan. 31, 2015 USD ($)	Jan. 31, 2015 EUR (€)	Sep. 30, 2014 EUR (€)	Sep. 30, 2013 USD ($)	Sep. 30, 2013 EUR (€)
Schedule of Equity Method Investments [Line Items]
Initial funding for equity method investment						$ 362	$ 3,929	$ 39,477
KBCD Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)																	21.00%	21.00%
Initial funding for equity method investment				$ 39,477	€ 30,724
BKB Bank [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)						9.34%			9.34%
Company and affiliated investors ownership, percentage						100.00%			100.00%	100.00%	100.00%
Wholly-owned subsidiary [Member] | Champ Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (percentage)				59.00%												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	$ 50,000	€ 38,000
Unfunded Commitment, Champ L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest						$ 2,947			€ 2,802	$ 2,947	€ 2,802	$ 2,947	€ 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		$ 20,794	€ 16,314
Foreign exchange adjustments included in other comprehensive loss		$ 2,614
Champ LP [Member] | Additional Investment [Member]
Schedule of Equity Method Investments [Line Items]
Commitment to invest														$ 3,929	€ 3,331

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