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Consolidated Statements Of Changes In Equity (USD $)
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Non-Controlling Interests - Non-Redeemable [Member]
Total Equity (Permanent) [Member]
Non-controlling Interests - Redeemable (Temporary Equity) [Member]
Balance at Dec. 31, 2009 $ 163,729,000$ 343,236,000$ (1,849,000)$ 5,255,000$ 510,371,000$ 123,363,000
Balance (in shares) at Dec. 31, 2009 30,674,000     
Issuance of restricted common stock (in shares) 231,000     
Cancellation of restricted common stock (in shares) (23,000)     
Stock options exercised 683,000   683,000 
Stock options exercised (in shares) 43,000     
Share-based compensation, value3,425,0003,425,000   3,425,000 
Tax benefit related to exercise of stock options (16,000)   (16,000) 
Net earnings135,275,000 38,957,000 3,278,00042,235,00093,040,000
Distributions to noncontrolling interests, net of capital contributions    (3,766,000)(3,766,000)(94,872,000)
Purchase of noncontrolling interest, value 893,000  (137,000)756,000(1,046,000)
Sale of noncontrolling interest, value (502,000)  219,000(283,000)614,000
Acquisitions and other transactions impacting noncontrolling interests    3,386,0003,386,00018,337,000
Gain on interest rate swap, net of income tax expense of $332 and $607   941,000 941,000 
Balance at Sep. 30, 2010 168,212,000382,193,000(908,000)8,235,000557,732,000139,436,000
Balance (in shares) at Sep. 30, 2010 30,925,000     
Balance at Dec. 31, 2010576,867,000171,522,000393,061,000(515,000)12,799,000576,867,000147,740,000
Balance (in shares) at Dec. 31, 2010 31,040,000     
Issuance of restricted common stock (in shares) 277,000     
Cancellation of restricted common stock (525,000)   (525,000) 
Cancellation of restricted common stock (in shares) (23,000)     
Stock options exercised 4,760,000   4,760,000 
Stock options exercised (in shares)244,125244,000     
Stock repurchased6,185,000(6,185,000)   (6,185,000) 
Stock repurchased (in shares)248,100(248,000)     
Share-based compensation, value4,762,0004,762,000   4,762,000 
Tax benefit related to exercise of stock options 169,000   169,000 
Net earnings138,622,000 36,449,000 5,611,00042,060,00096,562,000
Distributions to noncontrolling interests, net of capital contributions    (5,411,000)(5,411,000)(97,952,000)
Purchase of noncontrolling interest, value (296,000)   (296,000)(788,000)
Sale of noncontrolling interest, value (1,427,000)   (1,427,000)1,772,000
Acquisitions and other transactions impacting noncontrolling interests    87,294,00087,294,00020,318,000
Gain on interest rate swap, net of income tax expense of $332 and $607   515,000 515,000 
Balance at Sep. 30, 2011$ 702,583,000$ 172,780,000$ 429,510,000$ 0$ 100,293,000$ 702,583,000$ 167,652,000
Balance (in shares) at Sep. 30, 2011 31,290,000