Description of the business: (Tables)

6 Months Ended

Jun. 30, 2020

Description of the business and recent developments:

Schedule of diluted weighted average shares

	Three Months Ended	Three Months Ended	Six Months Ended	Six Months Ended
	June 30, 2020	June 30, 2019	June 30, 2020	June 30, 2019
Weighted average common shares - basic	45,754,880	45,354,327	45,760,302	45,349,397
Dilutive effect of stock options	205,823	35,895	128,477	30,972
Dilutive effect of restricted stock	725,962	522,069	703,666	458,549
Weighted average common shares - diluted	46,686,665	45,912,291	46,592,445	45,838,918

Schedule of unvested and anti-dilutive shares

	Three Months	Three Months	Six Months	Six Months
	Ended	Ended	Ended	Ended
	June 30, 2020	June 30, 2019	June 30, 2020	June 30, 2019
Unvested shares of restricted common stock	1,521,942	1,442,520	1,521,942	1,442,520
Anti-dilutive options for common stock	18,496	36,381	13,172	52,338
Anti-dilutive shares of restricted common stock	—	37,494	—	87,686

Schedule of Stockholder's Deficit

The following details the changes in stockholder’s deficit for the three and six months ended June 30, 2020 and June 30, 2019 (in thousands except share amounts):

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholder’s
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at March 31, 2020	47,139,369	$	47	$	499,455	$	(15,819)	$	(705,908)	$	(222,225)
Forfeitures of shares granted to employees	(972)		—		—		—		—		—
Equity-based compensation	—		—		6,666		—		—		6,666
Foreign currency translation	—		—		—		2,913		—		2,913
Issuances of common stock	135,280		—		—		—		—		—
Exercises of options	5,524		—		270		—		—		270
Dividends paid	—		—		—		—		(31,738)		(31,738)
Net income	—		—		—		—		8,564		8,564
Balance at June 30, 2020	47,279,201	$	47	$	506,391	$	(12,906)	$	(729,082)	$	(235,550)

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholder’s
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at March 31, 2019	46,350,434	$	46	$	475,275	$	(12,753)	$	(626,799)	$	(164,231)
Forfeitures of shares granted to employees	(1,702)		—		—		—		—		—
Equity-based compensation	—		—		5,714		—		—		5,714
Foreign currency translation	—		—		—		1,786		—		1,786
Issuances of common stock	438,478		1		—		—		—		1
Exercises of options	19,160		—		745		—		—		745
Dividends paid	—		—		—		—		(27,741)		(27,741)
Net income	—		—		—		—		7,136		7,136
Balance at June 30, 2019	46,806,370	$	47	$	481,734	$	(10,967)	$	(647,404)	$	(176,590)

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholder's
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at December 31, 2019	46,840,434	$	47	$	493,178	$	(12,326)	$	(684,578)	$	(203,679)
Forfeitures of shares granted to employees	(37,280)		—		—		—		—		—
Equity-based compensation	—		—		12,224		—		—		12,224
Foreign currency translation	—		—		—		(580)		—		(580)
Issuances of common stock	455,030		-		—		—		—		-
Exercises of options	21,017		—		989		—		—		989
Dividends paid	—		—		—		—		(62,295)		(62,295)
Net income	—		—		—		—		17,791		17,791
Balance at June 30, 2020	47,279,201	$	47	$	506,391	$	(12,906)	$	(729,082)	$	(235,550)

						Accumulated
				Additional		Other				Total
	Common Stock			Paid-in		Comprehensive		Accumulated		Stockholder's
	Shares	Amount		Capital		Income (Loss)		Deficit		Equity (Deficit)
Balance at December 31, 2018	46,336,499	$	46	$	471,331	$	(10,928)	$	(609,451)	$	(149,002)
Forfeitures of shares granted to employees	(3,886)		—		—		—		—		—
Equity-based compensation	—		—		9,484		—		—		9,484
Foreign currency translation	—		—		—		(39)		—		(39)
Issuances of common stock	448,978		1		—		—		—		1
Exercises of options	24,779		—		919		—		—		919
Dividends paid	—		—		—		—		(54,306)		(54,306)
Net income	—		—		—		—		16,353		16,353
Balance at June 30, 2019	46,806,370	$	47	$	481,734	$	(10,967)	$	(647,404)	$	(176,590)

Schedule of lease cost

	Three Months		Three Months
	Ended		Ended
	June 30, 2020		June 30, 2019
Finance lease cost
Amortization of right-of-use assets	$	4,973	$	4,917
Interest expense on finance lease liabilities		4,517		4,415
Operating lease cost		4,405		3,486
Total lease costs	$	13,895	$	12,818

	Six Months			Six Months
	Ended			Ended
	June 30, 2020			June 30, 2019
Finance lease cost
Amortization of right-of-use assets	$	9,735		$	9,888
Interest expense on finance lease liabilities		8,990			8,816
Operating lease cost		8,592			6,780
Total lease costs	$	27,317		$	25,484
Other lease information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from finance leases	$	(8,985)		$	(8,827)
Operating cash flows from operating leases		(9,149)			(6,780)
Financing cash flows from finance leases		(9,883)			(5,006)
Right-of-use assets obtained in exchange for new finance lease liabilities		42,359			8,562
Right-of-use assets obtained in exchange for new operating lease liabilities		20,694			1,457
Weighted-average remaining lease term — finance leases (in years)		12.1			14.6
Weighted-average remaining lease term — operating leases (in years)		20.4			22.3
Weighted average discount rate — finance leases		10.8	%		10.6	%
Weighted average discount rate — operating leases		5.4	%		5.7	%

Schedule of future minimum payments under finance leases

The future minimum payments (principal and interest) under these finance leases are as follows (in thousands):

For the twelve months ending June 30,
2021	$	32,568
2022		31,800
2023		30,772
2024		30,051
2025		29,710
Thereafter		214,604
Total minimum finance lease obligations		369,505
Less—amounts representing interest		(165,727)
Present value of minimum finance lease obligations		203,778
Current maturities		(14,734)
Finance lease obligations, net of current maturities	$	189,044

Schedule of future minimum payments under operating lease agreements

The future minimum payments under these operating lease agreements are as follows (in thousands):

For the twelve months ending June 30,
2021	$	16,725
2022		16,108
2023		14,918
2024		13,833
2025		12,097
Thereafter		101,672
Total minimum operating lease obligations		175,353
Less—amounts representing interest		(64,910)
Present value of minimum operating lease obligations		110,443
Current maturities		(11,292)
Lease obligations, net of current maturities	$	99,151

Schedule of impact on financial statement line items from adopting ASC 606

			Current-period
	Balance at		Provision for		Write offs		Balance at
	December 31,		Expected Credit		Charged Against		June 30,
Description	2019		Losses		Allowance		2020
Allowance for credit losses (deducted from accounts receivable)
Six months ending June 30, 2020	$	1,771	$	2,768	$	(2,424)	$	2,115