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Strategic Investments and Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Summary of financial information for Albemarle & Bond    
Current assets $ 128,289 $ 104,408
Non-current assets 121,835 109,336
Total assets 250,124 213,744
Current liabilities 33,290 30,844
Non-current liabilities 37,797 11,970
Shareholders' equity 179,037 170,930
Total liabilities and shareholders' equity 250,124 213,744
Gross revenues 115,256 82,343
Gross profit 76,405 57,038
Profit for the year (net income) 13,668 13,528
Albemarle & Bond Holdings [Member]
    
Summary of financial information for Albemarle & Bond    
Current assets 134,387 121,519
Non-current assets 65,354 56,755
Total assets 199,741 178,274
Current liabilities 21,021 25,801
Non-current liabilities 62,169 53,497
Shareholders' equity 116,551 98,976
Total liabilities and shareholders' equity 199,741 178,274
Gross revenues 99,804 76,424
Gross profit 58,165 46,745
Profit for the year (net income) $ 14,208 $ 12,088