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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Earnings per share attributable to common shareholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior to revaluation of redeemable non-controlling interests, net of tax |  |  |  |  |  |  |  |  | $ 22,279 | $ 20,853 | $ 17,492
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax |  |  |  |  |  |  |  |  | (314) | (1,086) | 0
From continuing operations, net of tax |  |  |  |  |  |  |  |  | 21,965 | 19,767 | 17,492
From discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | (4,769)
Net income attributable to common shareholders |  |  |  |  |  |  |  |  | $ 21,965 | $ 19,767 | $ 12,723
Basic earnings per share attributable to common shareholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) | $ 0.48 | $ 0.47 | $ 0.51 | $ 0.34 | $ 0.41 | $ 0.43 | $ 0.53 | $ 0.35 | $ 1.80 | $ 1.71 | $ 1.45
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax (in dollars per share) |  |  |  |  |  |  |  |  | (0.03) | (0.09) | 0
From continuing operations, net of tax (in dollars per share) |  |  |  |  |  |  |  |  | 1.77 | 1.62 | 1.45
From discontinued operations, net of tax (in dollars per share) |  |  |  |  |  |  |  |  | 0 | 0 | (0.40)
Basic (in dollars per share) | 0.48 | 0.47 | 0.48 | 0.34 | 0.41 | 0.43 | 0.52 | 0.27 | 1.77 | 1.62 | 1.05
Diluted earnings per share attributable to common shareholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) | 0.48 | 0.47 | 0.51 | 0.34 | 0.41 | 0.43 | 0.53 | 0.35 | 1.80 | 1.71 | 1.45
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax (in dollars per share) | 0 | 0 | (0.03) | 0 | 0 | 0 | (0.01) | (0.08) | (0.03) | (0.09) | 0
From continuing operations, net of tax (in dollars per share) |  |  |  |  |  |  |  |  | 1.77 | 1.62 | 1.45
From discontinued operations, net of tax (in dollars per share) |  |  |  |  |  |  |  |  | 0 | 0 | (0.40)
Diluted (in dollars per share) | $ 0.48 | $ 0.47 | $ 0.48 | $ 0.34 | $ 0.41 | $ 0.43 | $ 0.52 | $ 0.27 | $ 1.77 | $ 1.62 | $ 1.05
Shares used in computation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share - weighted-average shares (in shares) | 12,421 | 12,421 | 12,409 | 12,313 | 12,267 | 12,244 | 12,224 | 12,129 | 12,392 | 12,217 | 12,063
Effect of dilutive securities - stock options (in shares) |  |  |  |  |  |  |  |  | 0 | 4 | 19
Denominator for diluted earnings per share - adjusted weighted-average shares (in shares) | 12,421 | 12,421 | 12,409 | 12,313 | 12,271 | 12,247 | 12,226 | 12,144 | 12,392 | 12,221 | 12,082

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