Derivative Instruments (Narrative) (Details) ¥ in Billions	1 Months Ended		3 Months Ended
	Apr. 30, 2015 JPY (¥)	Apr. 30, 2015 USD ($)	Mar. 31, 2016 USD ($) contract	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Embedded derivative liabilities			$ 2,600,000		$ 1,161,000
Number of forward purchase contracts | contract			3
Derivative Loss			$ 1,438,000	$ 2,810,000
Repayment of outstanding debt				13,500,000
Derivative liability			183,000		121,000
Loss on extinguishment of debt				$ (95,000)
DVB Bank SE [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Proceeds from Issuance of Debt		$ 32,000,000
Interest rate		4.16%
Debt instrument term, years	5 years	5 years
Amortization period	10 years	10 years
Final quarterly balloon payment		$ 16,800,000
Loss on extinguishment of debt		300,000
Debt issuance costs capitalized		600,000
Foreign Exchange Contracts [Member] | DVB Bank SE [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Repayment of outstanding debt	¥ 2.9	24,000,000
Foreign Exchange Contract 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of forward purchase contracts					$ 900,000
Exchange rate					13.6007
Foreign Exchange Contract 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of forward purchase contracts					$ 900,000
Exchange rate					13.7503
Foreign Exchange Contract 3 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of forward purchase contracts					$ 600,000
Exchange rate					14.1934
Minimum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded derivative liabilities			1,800,000
Maximum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded derivative liabilities			$ 4,900,000
Interest Rate Swaps [Member] | DVB Bank SE [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Yen denominated interest rate swap settled		2,900,000
Foreign Exchange Contracts [Member] | DVB Bank SE [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Yen denominated foreign forward exchange contract settled		$ 4,000,000