Share Based Compensation (Share Based Compensation Plans) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted	148,300	134,600	183,500
Restricted stock awards forfeited	(18,000)	(2,120)	(4,100)
Director stock awards granted	2,500	4,000	4,000
Shares released from Deferred Compensation Plan	(1,692)	0	(63)
Stock Option, Outstanding as of December 31,	1,281,821	1,272,192	1,130,356	1,481,280
Total Options, Granted, Number of Shares	529,912	173,700	290,960
Stock Options, Exercised, Number of Shares	(328,077)	(149,781)	(146,169)
Stock Options, Forfeited, Number of Shares	(800)	0	(1,920)
Stock Options, Expired, Number of Shares	(1,576)	(14,290)	(1,035)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	31,586	39,980	47,376
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	508,495	1,200,417	538,287
Era Group [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Options, Granted, Number of Shares	318,012
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, Outstanding Beginning of Period	0	1,130	531
Restricted Stock Unit, Granted	0	0	650
Restricted Stock Unit, Converted to shares and issued to Deferred Compensation Plan	0	1,130	51
Restricted Stock, Outstanding End of Period	0	0	1,130