Consolidated Statements of Equity (USD $) In Thousands, unless otherwise specified	Total	Common stock	Additional paid-in capital	Retained earnings	Treasury stock, at cost	Non-controlling interests
Balance at Dec. 31, 2010	$ 151,898	$ 25,413	$ 79,297	$ 58,546	$ (14,418)	$ 3,060
Balance (in shares) at Dec. 31, 2010		25,413
Increase (Decrease) in Equity
Net income	77,967			71,112		6,855
Contributions from non-controlling interest holders	49					49
Distributions to non-controlling interest holders	(6,776)					(6,776)
Share-based compensation expense	3,932		3,932
Exercise of stock options	1,024			(3,497)	4,521
Repurchase of shares	(62,151)				(62,151)
Balance at Dec. 31, 2011	165,943	25,413	83,229	126,161	(72,048)	3,188
Balance (in shares) at Dec. 31, 2011		25,413
Increase (Decrease) in Equity
Net income	115,911			110,627		5,284
Contributions from non-controlling interest holders	43					43
Distributions to non-controlling interest holders	(7,145)					(7,145)
Net assets distributed in connection with the Separation of the Residential Asset Businesses	(105,000)			(105,000)
Share-based compensation expense	3,644		3,644
Exercise of stock options	3,214			(7,661)	10,875
Repurchase of shares	(16,781)				(16,781)
Balance at Dec. 31, 2012	159,829	25,413	86,873	124,127	(77,954)	1,370
Balance (in shares) at Dec. 31, 2012		25,413
Increase (Decrease) in Equity
Net income	133,793			129,973		3,820
Contributions from non-controlling interest holders	28					28
Distributions to non-controlling interest holders	(4,176)					(4,176)
Share-based compensation expense	2,400		2,400
Exercise of stock options	6,885			(14,539)	21,424
Repurchase of shares	(141,018)				(141,018)
Balance at Dec. 31, 2013	$ 157,741	$ 25,413	$ 89,273	$ 239,561	$ (197,548)	$ 1,042
Balance (in shares) at Dec. 31, 2013		25,413