Shareholders' Equity - Share Repurchase (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Sep. 21, 2015
Class of Stock [Line Items]
Total price from repurchase of common shares	$ 96,098,000
Class A common shares
Class of Stock [Line Items]
Repurchase of Class A common stock, authorized amount (up to)		$ 300,000,000
Average price per share of Class A common shares	$ 15.44
Total price from repurchase of common shares	$ 96,000,000
Remaining repurchase authorization	$ 146,700,000
Common Stock | Class A common shares
Class of Stock [Line Items]
Repurchases of Class A common shares (in shares)	6,215,656
Total price from repurchase of common shares	$ 62,000