Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule of Reconciliation of Numerator and Denominator for Basic and Diluted Earnings Per Share

Year ended December 31,	2012		2011		2010
Numerator:
Net income	$	70,629	$	40,015	$	28,255
Denominator:
Weighted average number of common shares outstanding - Basic		19,160,849		18,919,489		19,032,557
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans		474,392		232,909		266,636
Weighted average number of common shares outstanding - Diluted		19,635,241		19,152,398		19,299,193