Annual report pursuant to Section 13 and 15(d)

Schedule of Equity Method Investment, Financial Information, Statement of Operations (Details)

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Schedule of Equity Method Investment, Financial Information, Statement of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]      
Cumulative unfunded net losses of equity investees $ 100 $ 2,200  
Dart Holding Company Ltd.      
Schedule of Equity Method Investments [Line Items]      
Operating revenues 33,190 40,174 $ 39,185
Operating and administrative 32,869 31,755 31,538
Depreciation and amortization 4,224 4,129 5,213
Total Costs and Expenses 37,093 35,884 36,751
Operating income (3,903) 4,290 2,434
Net income (3,150) 2,172 789
Other Investments      
Schedule of Equity Method Investments [Line Items]      
Operating revenues 622 2,737 4,682
Operating and administrative 685 750 1,035
Depreciation and amortization 740 2,370 3,450
Total Costs and Expenses 1,425 3,120 4,485
Operating income (803) (383) 197
Net income $ (1,064) $ (749) $ (476)