Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Revenues	$ 1,169,120	$ 1,348,365	$ 1,238,961
Cost of revenues:
Cost of revenues	766,501	849,195	800,427
Gross profit	402,619	499,170	438,534
Selling, general and administrative expenses	289,264	311,026	278,298
Impairment of goodwill	61,994	12,184
Merger costs	503	416	708
Gain from sales of property and equipment, net	10,966	4,617	7,118
Income from operations	61,824	180,161	166,646
Other income (expense):
Interest expense	(61,790)	(68,277)	(63,707)
Loss on early extinguishment of debt	(44,630)
Other, net	3,210	3,977	1,724
Total other expense, net	(103,210)	(64,300)	(61,983)
Income (loss) before provision (benefit) for income taxes	(41,386)	115,861	104,663
Provision (benefit) for income taxes	(8,719)	28,650	28,040
Net income (loss)	$ (32,667)	$ 87,211	$ 76,623
Net income (loss) per common share:
Basic	$ (0.91)	$ 2.43	$ 2.15
Diluted	$ (0.91)	$ 2.42	$ 2.13
Weighted average common shares outstanding:
Basic	36,067	35,859	35,677
Diluted	36,067	36,033	35,903
Dividends declared per common share outstanding	$ 1.10	$ 1.10	$ 1.10
Equipment Rentals [Member]
Cost of revenues:
Cost of revenues	$ 399,061	$ 419,472	$ 353,422
Equipment Rentals [Member] | Rentals Other [Member]
Cost of revenues:
Cost of revenues	65,194	70,613	55,449
Equipment Rentals [Member] | Rental Depreciation [Member]
Cost of revenues:
Cost of revenues	233,809	243,780	208,453
Equipment Rentals [Member] | Rental Expense [Member]
Cost of revenues:
Cost of revenues	100,058	105,079	89,520
New Equipment Sales [Member]
Cost of revenues:
Cost of revenues	149,066	211,372	232,057
Used Equipment Sales [Member]
Cost of revenues:
Cost of revenues	104,590	92,021	86,052
Parts Sales [Member]
Cost of revenues:
Cost of revenues	82,155	90,963	88,263
Services Revenues [Member]
Cost of revenues:
Cost of revenues	21,176	21,946	21,328
Other [Member]
Cost of revenues:
Cost of revenues	10,453	13,421	19,305
Equipment Rentals [Member]
Revenues:
Revenues	662,993	766,354	627,181
New Equipment Sales [Member]
Revenues:
Revenues	167,130	239,091	262,948
Cost of revenues:
Impairment of goodwill	10,700	10,700
Used Equipment Sales [Member]
Revenues:
Revenues	153,152	139,349	125,125
Parts Sales [Member]
Revenues:
Revenues	110,594	123,855	120,454
Services Revenues [Member]
Revenues:
Revenues	64,253	67,941	63,488
Other [Member]
Revenues:
Revenues	$ 10,998	$ 11,775	$ 39,765