Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Leasing revenues:
Operating leases	$ 1,141,165	$ 813,357	$ 699,810
Finance leases	22,352	15,337	8,029
Total leasing revenues	1,163,517	828,694	707,839
Equipment trading revenues	37,419	16,418	0
Equipment trading expenses	(33,235)	(15,800)	0
Trading margin	4,184	618	0
Net gain (loss) on sale of leasing equipment	35,812	(20,347)	2,013
Operating expenses:
Depreciation and amortization	500,720	392,592	300,470
Direct operating expenses	62,891	84,256	54,440
Administrative expenses	87,609	65,618	53,435
Transaction and other costs	9,272	66,916	22,185
Provision (reversal) for doubtful accounts	3,347	23,304	(2,156)
Insurance Recoveries	(6,764)	0	0
Total operating expenses	657,075	632,686	428,374
Operating income	546,438	176,279	281,478
Other expenses:
Interest and debt expense	282,347	184,014	140,644
Realized loss on derivative instruments, net	900	3,438	5,496
Non-designated interest rate swaps	(1,397)	(4,405)	2,240
Write-off of debt costs	6,973	141	1,170
Other (income) expense, net	(2,637)	(1,076)	211
Total other expenses	286,186	182,112	149,761
Income (loss) before income taxes	260,252	(5,833)	131,717
Income tax (benefit) expense	(93,274)	(48)	4,048
Net income (loss)	353,526	(5,785)	127,669
Less: income attributable to non-controlling interest	8,928	7,732	16,580
Net income (loss) attributable to shareholders	$ 344,598	$ (13,517)	$ 111,089
Net income (loss) per common share—Basic	$ 4.55	$ (0.24)	$ 2.75
Net income (loss) per common share—Diluted	4.52	(0.24)	2.71
Cash dividends paid per common share	$ 1.80	$ 1.35	$ 0.00
Weighted average number of common shares and non-voting common shares outstanding—Basic	75,679	56,032	40,429
Dilutive stock options and restricted stock	509	0	503
Weighted average number of common shares and non-voting common shares outstanding—Diluted	76,188	56,032	40,932
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Other expenses:
Non-designated interest rate swaps	$ (1,397)	$ (4,405)	$ 2,240
Noncontrolling Interest [Member]
Other expenses:
Net income (loss)			$ 16,580