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Basic and diluted net income per share (Schedule of Calculation of Basic and Diluted Net Income Per Share) (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 CNY (¥) ¥ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) ¥ / shares shares | Dec. 31, 2014 CNY (¥) ¥ / shares shares
Numerator: |  |  |  |  |
Net income attributable to the Company |  | ¥ 1,523,918 | $ 219,491 | ¥ 1,033,243 | ¥ 1,064,472
Interest expenses of convertible notes | ¥ |  | 81,085 |  |  |
Numerator for diluted income per share | ¥ |  | ¥ 1,605,003 |  | ¥ 1,033,243 | ¥ 1,064,472
Denominator: |  |  |  |  |
Denominator for basic calculation—weighted average number of Class A and Class B common shares outstanding | [1] | 1,127,343,312 | 1,127,343,312 | 1,125,189,978 | 1,153,140,699
Dilutive effect of share options |  | 684,455 | 684,455 | 2,711,486 | 10,372,442
Dilutive effect of restricted shares |  |  |  |  | 2,604,789
Dilutive effect of restricted share units |  | 15,816,362 | 15,816,362 | 22,929,699 | 32,425,543
Dilutive effect of convertible bonds |  | 72,267,200 | 72,267,200 |  |
Denominator for diluted calculation (in shares) | [1] | 1,216,111,329 | 1,216,111,329 | 1,150,831,163 | 1,198,543,473
Basic net income per share (in CNY/dollars per share) | (per share) | [1] | ¥ 1.35 | $ 0.19 | ¥ 0.92 | ¥ 0.92
Diluted net income per share (in CNY/dollars per share) | (per share) | [1] | ¥ 1.32 | $ 0.19 | ¥ 0.9 | ¥ 0.89
American Depository Shares [Member] |  |  |  |  |
Denominator: |  |  |  |  |
Denominator for basic calculation—weighted average number of Class A and Class B common shares outstanding | [1] | 56,367,166 | 56,367,166 | 56,259,499 | 57,657,035
Denominator for diluted calculation (in shares) | [1] | 60,805,566 | 60,805,566 | 57,541,558 | 59,927,174
Basic net income per share (in CNY/dollars per share) | (per share) | [1] | ¥ 27.04 | $ 3.89 | ¥ 18.37 | ¥ 18.46
Diluted net income per share (in CNY/dollars per share) | (per share) | [1] | ¥ 26.4 | $ 3.8 | ¥ 17.96 | ¥ 17.76
[1] | Each ADS represents 20 Class A common shares.

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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