Earnings Per Share Computation Of Basic And Diluted Earnings Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net income from continuing operations	$ 35,279	$ 21,469	$ 38,573	$ 31,624	$ 19,776	$ 42,637	$ 56,748	$ 51,400	$ 89,973	$ 100,639	$ 113,350	$ 121,278	$ 110,833
Income from discontinued operations	121			183			1,762	150
Net income	35,400			31,807			58,510	51,550
Denominator:
Basic earnings per share (in dollars per share)	$ 0.61			$ 0.54			$ 1.00	$ 0.88
Numerator:
Net income from continuing operations	35,279	21,469	38,573	31,624	19,776	42,637	56,748	51,400	89,973	100,639	113,350	121,278	110,833
Income from discontinued operations	121			183			1,762	150
Net income	35,400			31,807			58,510	51,550
Denominator:
Diluted earnings per share (in dollars per share)	$ 0.60			$ 0.54			$ 0.99	$ 0.88
Basic earnings per share [Member]
Numerator:
Net income from continuing operations	35,279			31,624			56,748	51,400
Income from discontinued operations	121			183			1,762	150
Net income	35,400			31,807			58,510	51,550
Income allocated to participating securities	(324)			(310)			(523)	(521)
Net income available to common shareholders, basic	35,076			31,497			57,987	51,029
Denominator:
Weighted average common shares outstanding - basic	57,893			57,953			57,850	57,837
Numerator:
Net income from continuing operations	35,279			31,624			56,748	51,400
Income from discontinued operations	121			183			1,762	150
Net income	35,400			31,807			58,510	51,550
Income allocated to participating securities	(324)			(310)			(523)	(521)
Denominator:
Weighted average common shares outstanding - basic	57,893			57,953			57,850	57,837
Diluted earnings per share [Member]
Numerator:
Net income from continuing operations	35,279			31,624			56,748	51,400
Income from discontinued operations	121			183			1,762	150
Net income	35,400			31,807			58,510	51,550
Income allocated to participating securities	(322)			(309)			(521)	(519)
Denominator:
Weighted average common shares outstanding - basic	57,893			57,953			57,850	57,837
Numerator:
Net income from continuing operations	35,279			31,624			56,748	51,400
Income from discontinued operations	121			183			1,762	150
Net income	35,400			31,807			58,510	51,550
Income allocated to participating securities	(322)			(309)			(521)	(519)
Net income available to common shareholders, diluted	35,078			31,498			57,989	51,031
Denominator:
Weighted average common shares outstanding - basic	57,893			57,953			57,850	57,837
Diluted effect of stock options and PVRSUs	492			386			491	376
Weighted average common shares outstanding - diluted	58,385			58,339			58,341	58,213
Continuing operations [Member]
Denominator:
Basic earnings per share (in dollars per share)	$ 0.61			$ 0.54			$ 0.97	$ 0.88
Denominator:
Diluted earnings per share (in dollars per share)	$ 0.60			$ 0.54			$ 0.96	$ 0.88
Discontinued Operations [Member]
Numerator:
Net income from continuing operations			(143)	(183)		(107)		(150)	(293)	(270)	(359)	(335)	(228)
Income from discontinued operations	121			183			1,762	150
Denominator:
Basic earnings per share (in dollars per share)	$ 0.00			$ 0.00			$ 0.03	$ 0.00
Numerator:
Net income from continuing operations			(143)	(183)		(107)		(150)	(293)	(270)	(359)	(335)	(228)
Income from discontinued operations	$ 121			$ 183			$ 1,762	$ 150
Denominator:
Diluted earnings per share (in dollars per share)	$ 0.00			$ 0.00			$ 0.03	$ 0.00