Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Current assets	$ 33,475	$ 72,641	[1]
Deferred tax assets, net	24,908	28,667	[1]
Other non-current assets	364,643	304,458
Total Assets	423,026	405,766	[1]
Deferred current revenue	9,850	10,758	[1]
Other current liabilities	70,596	55,228
Non-current liabilities	161,339	193,165
Total Liabilities	241,785	259,151	[1]
Retained earnings (accumulated deficit)	32,679	1,680	[1]
Other equity components	148,562	144,935
Total Stockholders' Equity	181,241	146,615	[1]	$ 138,951	$ 133,716
Total Liabilities and Stockholders’ Equity	423,026	405,766	[1]
Without Breakage Revenue [Member]
Current assets	33,475	72,641
Deferred tax assets, net	25,147	28,900
Other non-current assets	364,643	304,458
Total Assets	423,265	405,999
Deferred current revenue	10,458	11,376
Other current liabilities	70,596	55,228
Non-current liabilities	161,339	193,165
Total Liabilities	242,393	259,769
Retained earnings (accumulated deficit)	32,310	1,295
Other equity components	148,562	144,935
Total Stockholders' Equity	180,872	146,230
Total Liabilities and Stockholders’ Equity	423,265	405,999
Adjustment [Member]
Deferred tax assets, net	(239)	(233)
Total Assets	(239)	(233)
Deferred current revenue	(608)	(618)
Total Liabilities	(608)	(618)
Retained earnings (accumulated deficit)	369	385
Total Stockholders' Equity	369	385
Total Liabilities and Stockholders’ Equity	$ (239)	$ (233)

[1] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).