New Accounting Pronouncements - Effect of Accounting Standards Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 30,115	$ 39,940	$ 39,940	$ 51,370
Accounts and notes receivable, net	95,795	75,643	75,643
Inventory, net	10,618	11,392	11,392
Restricted cash	87,354	155,470	155,470
Prepaid expenses, deferred costs, and other current assets	84,639	87,869	84,386
Total current assets	308,521	370,314	366,831
Property and equipment, net of accumulated depreciation	461,277	460,187	460,187
Intangible assets, net	113,925	150,847	150,847
Goodwill	752,592	749,144	749,144
Operating lease assets	76,548	85,068	0
Deferred tax asset, net	13,159	8,658	8,658
Prepaid expenses, deferred costs, and other noncurrent assets	37,936	51,677	51,677
Total assets	1,763,958	1,875,895	1,787,344
Current liabilities:
Current portion of other long-term liabilities	53,144	40,868	20,266
Accounts payable	46,478	39,310	39,310
Accrued liabilities	334,762	368,713	369,160
Total current liabilities	434,384	448,891	428,736
Long-term liabilities:
Long-term debt	739,475	818,485	818,485
Asset retirement obligations	55,494	54,413	54,413
Noncurrent operating lease liabilities	69,531	74,746	0
Deferred tax liability, net	46,878	41,198	41,198
Other long-term liabilities	37,870	61,390	67,740
Total liabilities	1,383,632	1,499,123	1,410,572
Commitments and contingencies
Shareholders' equity:
Ordinary shares	447	461	461
Additional paid-in capital	332,109	327,009	327,009
Accumulated other comprehensive loss, net	(77,887)	(66,511)	(66,877)
Retained earnings	125,763	115,910	116,276
Total parent shareholders' equity	380,432	376,869	376,869
Noncontrolling interests	(106)	(97)	(97)
Total shareholders’ equity	380,326	376,772	376,772	$ 390,393	$ 456,935
Total liabilities and shareholders’ equity	$ 1,763,958	1,875,895	$ 1,787,344
ASC Topic 842 (Leases)
Current assets:
Cash and cash equivalents		0
Accounts and notes receivable, net		0
Inventory, net		0
Restricted cash		0
Prepaid expenses, deferred costs, and other current assets		3,483
Total current assets		3,483
Property and equipment, net of accumulated depreciation		0
Intangible assets, net		0
Goodwill		0
Operating lease assets		85,068
Deferred tax asset, net		0
Prepaid expenses, deferred costs, and other noncurrent assets		0
Total assets		88,551
Current liabilities:
Current portion of other long-term liabilities		20,602
Accounts payable		0
Accrued liabilities		(447)
Total current liabilities		20,155
Long-term liabilities:
Long-term debt		0
Asset retirement obligations		0
Noncurrent operating lease liabilities		74,746
Deferred tax liability, net		0
Other long-term liabilities		(6,350)
Total liabilities		88,551
Commitments and contingencies
Shareholders' equity:
Ordinary shares		0
Additional paid-in capital		0
Accumulated other comprehensive loss, net		0
Retained earnings		0
Total parent shareholders' equity		0
Noncontrolling interests		0
Total shareholders’ equity		0
Total liabilities and shareholders’ equity		88,551
ASU 2017-12 (Hedging)
Current assets:
Cash and cash equivalents		0
Accounts and notes receivable, net		0
Inventory, net		0
Restricted cash		0
Prepaid expenses, deferred costs, and other current assets		0
Total current assets		0
Property and equipment, net of accumulated depreciation		0
Intangible assets, net		0
Goodwill		0
Operating lease assets		0
Deferred tax asset, net		0
Prepaid expenses, deferred costs, and other noncurrent assets		0
Total assets		0
Current liabilities:
Current portion of other long-term liabilities		0
Accounts payable		0
Accrued liabilities		0
Total current liabilities		0
Long-term liabilities:
Long-term debt		0
Asset retirement obligations		0
Noncurrent operating lease liabilities		0
Deferred tax liability, net		0
Other long-term liabilities		0
Total liabilities		0
Commitments and contingencies
Shareholders' equity:
Ordinary shares		0
Additional paid-in capital		0
Accumulated other comprehensive loss, net		366
Retained earnings		(366)
Total parent shareholders' equity		0
Noncontrolling interests		0
Total shareholders’ equity		0
Total liabilities and shareholders’ equity		$ 0