GUARANTOR - Condensed Cash Flow (Details) - USD ($)	1 Months Ended								3 Months Ended								12 Months Ended
	Dec. 15, 2017	Sep. 15, 2017	Aug. 30, 2017	Jun. 15, 2017	Mar. 15, 2017	Dec. 15, 2016	Sep. 15, 2016	Jun. 15, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES:
Net Cash Provided By Used In Operating Activities																		$ 29,112,000	$ 72,030,000	$ 64,790,000
INVESTING ACTIVITIES:
Additions to property and equipment																		(20,530,000)	(7,336,000)	(7,043,000)
Payments To Acquire non-amortizable intangible assets																	$ (15,000,000)	0	(112,000)	(100,000)
Proceeds (distributions) from investments in subsidiaries
Net cash provided by (used in) investing activities																		17,310,000	495,000	(91,744,000)
FINANCING ACTIVITIES:
Payments of long-term debt																		(669,750,000)	(293,266,000)	(51,250,000)
Retirement of senior subordinated notes																		0	(220,000,000)	0
Proceeds from issuance of employee stock plan																		182,000	379,000	0
Payments Of Stock Issuance Cost																		0	0	220,000
PaymentsOfDebtExtinguishmentCosts																		0	5,977,000	0
Proceeds from the exercise of stock options																		42,000	265,000	35,000
Payment of dividend equivalents on vested restricted stock units																		(1,556,000)	(94,000)	(7,000)
Payments of Dividends, Common Stock	$ 12,633,039	$ 2,921,727	$ 7,791,075	$ 2,920,860	$ 2,915,952	$ 2,891,608	$ 2,886,179	$ 2,885,838										29,296,000	8,666,000	0
NetCashProvidedByUsedInFinancingActivities																		(59,098,000)	(34,851,000)	4,583,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS																		(12,676,000)	37,674,000	(22,371,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR												$ 46,843,000				$ 9,169,000	34,167,000	46,843,000	9,169,000	31,540,000
CASH AND CASH EQUIVALENTS, END OF PERIOD									$ 34,167,000				$ 46,843,000					34,167,000	46,843,000	9,169,000
PaymentsOfDividendsPreferredStockAndPreferenceStock									924,000	$ 550,000	$ 550,000	550,000	550,000	$ 413,000	$ 413,000	412,000		2,574,000	1,788,000	413,000
Payments For Repurchase Of Equity																		2,565,000	2,268,000	1,562,000
Payments For Repurchase Of Common Stock																		10,042,000	0	0
Parent Company [Member]
OPERATING ACTIVITIES:
Net Cash Provided By Used In Operating Activities																		(69,704,000)	(24,344,000)	(25,355,000)
INVESTING ACTIVITIES:
Additions to property and equipment																		528,000	1,849,000	304,000
Payments To Acquire non-amortizable intangible assets																		0	182,000	1,142,000
Proceeds (distributions) from investments in subsidiaries																		116,127,000	44,527,000	29,030,000
Net cash provided by (used in) investing activities																		115,599,000	42,496,000	27,584,000
FINANCING ACTIVITIES:
Proceeds from issuance of employee stock plan																		182,000	379,000	0
Payments Of Stock Issuance Cost																		0	0	(220,000)
PaymentsOfDebtExtinguishmentCosts																		0	(5,977,000)	0
Proceeds from the exercise of stock options																		42,000	265,000	35,000
Payment of dividend equivalents on vested restricted stock units																		(1,556,000)	(94,000)	(7,000)
Payments of Dividends, Common Stock																		(29,296,000)	(8,666,000)	0
NetCashProvidedByUsedInFinancingActivities																		(45,809,000)	(18,149,000)	(2,167,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS																		86,000	3,000	62,000
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR												$ 198,000				$ 195,000	$ 284,000	198,000	195,000	133,000
CASH AND CASH EQUIVALENTS, END OF PERIOD									$ 284,000				$ 198,000					284,000	198,000	195,000
PaymentsOfDividendsPreferredStockAndPreferenceStock																		(2,574,000)	(1,788,000)	(413,000)
Payments For Repurchase Of Equity																		(2,565,000)	2,268,000	1,562,000
Payments For Repurchase Of Common Stock																		$ (10,042,000)	$ 0	$ 0