Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Shareholders' Equity [Abstract]

Issued share capital

	June 30,		December 31,
	2013		2012
Common shares issued and fully paid, 2013: CHF 12.30 per share; 2012: CHF 12.64 per share		35,429,423		36,369,868
Share capital at end of period	$	430,397	$	454,980

Schedule of common stock outstanding roll forward

	Six Months
	Ended
	June 30,
	2013
Shares issued at beginning of period	36,369,868
Shares cancelled	(940,445)
Total shares issued at end of period	35,429,423
Treasury shares issued at beginning of period	1,572,087
Shares repurchased	940,445
Shares issued out of treasury	(318,495)
Shares cancelled	(940,445)
Total treasury shares at end of period	1,253,592
Total shares outstanding at end of period	34,175,831

Dividends paid

	Partial
	Par Value		Dividend		Total
	Reduction		Per		Amount
Dividend Paid	Per Share		Share		Paid
March 12, 2013	CHF	0.34	$	0.375	$	12,981

Share repurchases

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Common shares repurchased		508,328		905,383		940,445		2,336,187
Total cost of shares repurchased	$	46,326	$	66,435	$	82,571	$	159,458
Average price per share	$	91.13	$	73.38	$	87.80	$	68.26