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Unconsolidated Joint Venture - Additional Information (Details) € in Thousands, $ in Thousands	1 Months Ended				12 Months Ended
	Feb. 28, 2015 USD ($)	Feb. 28, 2015 EUR (€)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2015	Feb. 28, 2015 EUR (€)	Jan. 31, 2015 USD ($)	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					$ 3,929	$ 39,477	$ 0
Champ Limited Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Company and affiliated investors ownership, percentage			100.00%									100.00%
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)					11.00%			11.00%
Company and affiliated investors ownership, percentage					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	$ 3,508								€ 3,229
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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