Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dividends paid to stockholders, per share $ 1.00us-gaap_CommonStockDividendsPerShareCashPaid $ 0.92us-gaap_CommonStockDividendsPerShareCashPaid $ 0.84us-gaap_CommonStockDividendsPerShareCashPaid