Discountinued Operations Discontinued Operations (Summarized Selected Operating Results) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues	$ 327,861	$ 336,784	$ 315,563	$ 267,064	$ 362,368	$ 338,855	$ 309,225	$ 297,849	$ 1,247,272	$ 1,308,297	$ 1,032,497
Administrative and general									141,348	166,743	131,772
Depreciation and amortization									134,518	131,667	106,873
Total costs and expenses									1,184,737	1,275,879	984,198
Gain (Loss) on Sale of Assets and Asset Impairment Charges									37,507	23,987	18,839
Operating Income (Loss)	30,307	51,508	19,254	(1,027)	9,332	20,058	(1,499)	28,514	100,042	56,405	67,138
Nonoperating Income (Expense)									(32,410)	(1,833)	(63,369)
Income Tax Expense (Benefit)									26,747	24,181	3,310
Income (Loss) from Equity Method Investments									7,264	(5,764)	9,908
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	9,120	30,769	19,296	(21,361)	(2,717)	15,504	11,299	36,373	37,824	60,459	42,150
SES Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues									0	22,387	131,346
Operating Expenses									0	18,234	90,267
Administrative and general									0	4,624	20,674
Depreciation and amortization									0	1,428	7,332
Total costs and expenses									0	24,286	118,273
Gain (Loss) on Sale of Assets and Asset Impairment Charges									0	(71)	(61)
Operating Income (Loss)									0	(1,970)	13,012
Nonoperating Income (Expense)									(1,537)	24,971	203
Income Tax Expense (Benefit)									(538)	6,342	5,659
Income (Loss) from Equity Method Investments									0	301	(49)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(999)	16,960	7,507
SEI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues									0	515,468	731,164
Operating Expenses									0	503,294	720,791
Administrative and general									0	5,579	3,290
Depreciation and amortization									0	(3)	7
Total costs and expenses									0	508,870	724,088
Operating Income (Loss)									0	6,598	7,076
Nonoperating Income (Expense)									(143)	8,083	(5,335)
Income Tax Expense (Benefit)									(50)	4,856	913
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(93)	9,825	828
Era Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues									22,892	272,921	258,148
Operating Expenses									14,076	167,195	162,707
Administrative and general									2,653	34,785	31,893
Depreciation and amortization									3,875	42,502	42,612
Total costs and expenses									20,604	244,482	237,212
Gain (Loss) on Sale of Assets and Asset Impairment Charges									548	3,612	15,172
Operating Income (Loss)									2,836	32,051	36,108
Nonoperating Income (Expense)									(1,316)	(9,478)	(1,439)
Income Tax Expense (Benefit)									10,818	7,998	11,303
Income (Loss) from Equity Method Investments									65	(5,528)	82
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									(9,233)	9,047	23,448
Consolidation, Eliminations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues									0	(109,941)	(11,213)
Operating Expenses									0	(109,938)	(11,131)
Administrative and general									0	(3)	(82)
Total costs and expenses									0	(109,941)	(11,213)
Operating Income (Loss)									$ 0	$ 0	$ 0