Debt (Details 1) $ in Thousands	Dec. 31, 2015 USD ($)
Capital Leases
Capital leases, 2016	$ 8,469
Capital leases, 2017	9,550
Capital leases, 2018	7,135
Capital leases, 2019	6,132
Capital leases, 2020	639
Capital leases, Thereafter	2,241
Capital leases, Total	34,166
Debt
Debt, 2016	928,722
Debt, 2017	750,009
Debt, 2018	783,177
Debt, 2019	1,060,365
Debt, 2020	1,645,441
Debt, Thereafter	312,835
Debt, Total	5,480,549
Maturities of debt
Imputed interest	(2,112)
Present value of minimum capitalized lease payments	32,054
Current portion	(7,720)
Long-term capitalized lease obligation	$ 24,334