Summary of Significant Accounting Policies (Summary of Temporary Differences and Carry Forwards Which Give Rise to Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax liabilities
Property and equipment	$ (3,089)	$ (4,940)	$ (15,031)
Goodwill	(1,953)	(1,396)	(1,290)
Intangibles	(11,910)	(13,606)	(24,244)
Other	(1,049)	(1,132)	(1,386)
Gross deferred tax liabilities	(18,001)	(21,074)	(41,951)
Deferred tax assets
Net operating loss carryforwards	17,610	8,888	18,035
Deferred revenue and setup charges	3,171	3,435	4,323
Leases	1	453	2,154
Other credits	287	543	492
Bad debt reserve	409	2,250	41
Interest expense carryforward IRC Sec 163(j)	2,253
Other	1,534	1,607	2,114
Gross deferred tax assets	25,265	17,176	27,159
Net deferred tax liability	7,264	(3,898)	(14,792)
Valuation allowance	(8,361)	(713)	(393)
Net deferred	$ (1,097)	$ (4,611)	$ (15,185)