GUARANTOR - Condensed Cash Flow (Details) - USD ($)	1 Months Ended			12 Months Ended
	Dec. 15, 2016	Sep. 15, 2016	Jun. 15, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES:
Net Cash Provided By Used In Operating Activities				$ 72,030,000	$ 64,790,000	$ 65,296,000
INVESTING ACTIVITIES:
Additions to property and equipment				(7,336,000)	(7,043,000)	(8,408,000)
Deferred charges and other assets				(353,000)	(1,575,000)	(800,000)
Proceeds (distributions) from investments in subsidiaries
Net cash provided by (used in) investing activities				495,000	(91,744,000)	(7,055,000)
FINANCING ACTIVITIES:
Payments of long-term debt				(293,266,000)	(51,250,000)	(53,000,000)
Retirement of senior subordinated notes				(220,000,000)	0	0
Proceeds from issuance of employee stock plan				379,000	0	0
Payments Of Stock Issuance Cost				0	220,000	0
PaymentsOfDebtExtinguishmentCosts				5,977,000	0	0
Proceeds from the exercise of stock options				265,000	35,000	82,000
Payment of dividend equivalents on vested restricted stock units				(94,000)	(7,000)	0
Payments of Dividends, Common Stock	$ 2,891,608	$ 2,886,179	$ 2,885,838	8,666,000	0	0
NetCashProvidedByUsedInFinancingActivities				(34,851,000)	4,583,000	(38,932,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS				37,674,000	(22,371,000)	19,309,000
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				9,169,000	31,540,000	12,231,000
CASH AND CASH EQUIVALENTS, END OF PERIOD				46,843,000	9,169,000	31,540,000
Parent Company [Member]
OPERATING ACTIVITIES:
Net Cash Provided By Used In Operating Activities				(24,344,000)	(25,355,000)	(21,652,000)
INVESTING ACTIVITIES:
Additions to property and equipment				(1,849,000)	(304,000)	(213,000)
Deferred charges and other assets				(182,000)	(1,142,000)	(481,000)
Proceeds (distributions) from investments in subsidiaries				44,527,000	29,030,000	23,610,000
Net cash provided by (used in) investing activities				42,496,000	27,584,000	22,916,000
FINANCING ACTIVITIES:
Proceeds from issuance of employee stock plan				379,000	0	0
Payments Of Stock Issuance Cost				0	(220,000)	0
PaymentsOfDebtExtinguishmentCosts				(5,977,000)	0	0
Proceeds from the exercise of stock options				265,000	35,000	82,000
Purchase of vested restricted stock units				(2,268,000)	(1,562,000)	(1,514,000)
Payment of dividend equivalents on vested restricted stock units				(94,000)	(7,000)	0
Payments of Dividends, Common Stock				(8,666,000)	0	0
NetCashProvidedByUsedInFinancingActivities				(18,149,000)	(2,167,000)	(1,432,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS				3,000	62,000	(168,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR				195,000	133,000	301,000
CASH AND CASH EQUIVALENTS, END OF PERIOD				$ 198,000	$ 195,000	$ 133,000