Guarantor/Non Guarantor Condensed Consolidated Financial Statements (Cash Flows (Unaudited)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	$ 142,719	$ 233,041	$ 174,580
Cash flows from investing activities:
Purchases of property and equipment	(159,615)	(175,378)	(165,356)
Proceeds from sale of property and equipment	57,674	8,370	13,836
Proceeds from sale of fishing and rental services operations	0	15,090	0
Proceeds from insurance recoveries	285	0	844
Net cash used in investing activities	(101,656)	(151,918)	(150,676)
Cash flows from financing activities:
Debt repayments	(60,002)	(490,025)	(60,874)
Proceeds from issuance of debt	0	440,000	40,000
Debt issuance costs	(1,877)	(9,239)	(13)
Tender premium costs	0	(21,553)	0
Proceeds from exercise of options	781	8,368	1,266
Purchase of treasury stock	(729)	(1,135)	(631)
Proceeds from Contributions from Affiliates	0	0	0
Net cash used in financing activities	(61,827)	(73,584)	(20,252)
Net increase (decrease) in cash and cash equivalents	(20,764)	7,539	3,652
Beginning cash and cash equivalents	34,924	27,385	23,733
Ending cash and cash equivalents	14,160	34,924	27,385
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	147,643	265,171	240,108
Cash flows from investing activities:
Purchases of property and equipment	(157,336)	(158,392)	(151,363)
Proceeds from sale of property and equipment	57,444	8,069	12,510
Proceeds from sale of fishing and rental services operations		0
Proceeds from insurance recoveries	285		844
Net cash used in investing activities	(99,607)	(150,323)	(138,009)
Cash flows from financing activities:
Debt repayments	(2)	(25)	(874)
Proceeds from issuance of debt		0	0
Debt issuance costs	0	0	0
Tender premium costs		0
Proceeds from exercise of options	0	0	0
Purchase of treasury stock	0	0	0
Proceeds from Contributions from Affiliates	(48,130)	(118,280)	(97,883)
Net cash used in financing activities	(48,132)	(118,305)	(98,757)
Net increase (decrease) in cash and cash equivalents	(96)	(3,457)	3,342
Beginning cash and cash equivalents	(5,516)	(2,059)	(5,401)
Ending cash and cash equivalents	(5,612)	(5,516)	(2,059)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	(8,991)	27,275	1,413
Cash flows from investing activities:
Purchases of property and equipment	(1,885)	(15,957)	(11,344)
Proceeds from sale of property and equipment	467	301	1,318
Proceeds from sale of fishing and rental services operations		0
Proceeds from insurance recoveries	0		0
Net cash used in investing activities	(1,418)	(15,656)	(10,026)
Cash flows from financing activities:
Debt repayments	0	0	0
Proceeds from issuance of debt		0	0
Debt issuance costs	0	0	0
Tender premium costs		0
Proceeds from exercise of options	0	0	0
Purchase of treasury stock	0	0	0
Proceeds from Contributions from Affiliates	208	57	(966)
Net cash used in financing activities	208	57	(966)
Net increase (decrease) in cash and cash equivalents	(10,201)	11,676	(9,579)
Beginning cash and cash equivalents	12,752	1,076	10,655
Ending cash and cash equivalents	2,551	12,752	1,076
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	0	0	0
Cash flows from investing activities:
Purchases of property and equipment	269	0	0
Proceeds from sale of property and equipment	(269)	0	0
Proceeds from sale of fishing and rental services operations		0
Proceeds from insurance recoveries	0		0
Net cash used in investing activities	0	0	0
Cash flows from financing activities:
Debt repayments	0	0	0
Proceeds from issuance of debt		0	0
Debt issuance costs	0	0	0
Tender premium costs		0
Proceeds from exercise of options	0	0	0
Purchase of treasury stock	0	0	0
Proceeds from Contributions from Affiliates	0	0	0
Net cash used in financing activities	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Beginning cash and cash equivalents	0	0	0
Ending cash and cash equivalents	0	0	0
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:			(66,941)
Cash flows from investing activities:
Purchases of property and equipment			(2,649)
Proceeds from sale of property and equipment			8
Proceeds from insurance recoveries			0
Net cash used in investing activities			(2,641)
Cash flows from financing activities:
Debt repayments			(60,000)
Proceeds from issuance of debt			40,000
Debt issuance costs			(13)
Proceeds from exercise of options			1,266
Purchase of treasury stock			(631)
Proceeds from Contributions from Affiliates			98,849
Net cash used in financing activities			79,471
Net increase (decrease) in cash and cash equivalents			9,889
Beginning cash and cash equivalents		28,368	18,479
Ending cash and cash equivalents			28,368
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities:	4,067	(59,405)
Cash flows from investing activities:
Purchases of property and equipment	(663)	(1,029)
Proceeds from sale of property and equipment	32	0
Proceeds from sale of fishing and rental services operations		15,090
Proceeds from insurance recoveries	0
Net cash used in investing activities	(631)	14,061
Cash flows from financing activities:
Debt repayments	(60,000)	(490,000)
Proceeds from issuance of debt		440,000
Debt issuance costs	(1,877)	(9,239)
Tender premium costs		(21,553)
Proceeds from exercise of options	781	8,368
Purchase of treasury stock	(729)	(1,135)
Proceeds from Contributions from Affiliates	47,922	118,223
Net cash used in financing activities	(13,903)	44,664
Net increase (decrease) in cash and cash equivalents	(10,467)	(680)
Beginning cash and cash equivalents	27,688	28,368
Ending cash and cash equivalents	$ 17,221	$ 27,688	$ 28,368