Debt (Details 1) $ in Thousands	Dec. 31, 2016 USD ($)
Capital Leases
Capital leases, 2017	$ 9,303
Capital leases, 2018	6,939
Capital leases, 2019	6,041
Capital leases, 2020	880
Capital leases, 2021	1,548
Capital leases, Thereafter	777
Capital leases, Total	25,488
Debt
Debt, 2017	957,358
Debt, 2018	791,324
Debt, 2019	1,068,657
Debt, 2020	1,606,313
Debt, 2021	704,482
Debt, Thereafter	237,846
Debt, Total	5,365,980
Maturities of debt
Imputed interest	(1,304)
Present value of minimum capitalized lease payments	24,184
Current portion	(8,695)
Long-term capitalized lease obligation	$ 15,489