Condensed Consolidated Statement Of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total stockholders’ equity	Noncontrolling Interests
Balance value at Dec. 31, 2013	$ 2,456,243	$ 1	$ 2,077,828	$ 520,764	$ (145,544)	$ 2,453,049	$ 3,194
Balance shares at Dec. 31, 2013		105,900
Net income	72,540			72,318		72,318	222
Dividends on common shares	(38,441)			(38,441)		(38,441)
Shares issued in connection with share-based compensation plans, value	4,916		5,823	(907)		4,916
Shares issued in connection with share-based compensation plans, shares		1,200
Share-based compensation expense	12,519		12,519			12,519
Net activity related to noncontrolling interests	(633)		76			76	(709)
Other comprehensive income (Note 15)	39,594				39,587	39,587	7
Balance value at Jun. 30, 2014	$ 2,546,738	$ 1	$ 2,096,246	$ 553,734	$ (105,957)	$ 2,544,024	$ 2,714
Balance shares at Jun. 30, 2014		107,100