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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
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