Consolidated Statement of Equity (Statement) - USD ($)	Total	Parent [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares, Issued				30,294,224			5,059
Shares issued pursuant to sale of equity				5,175,000
Exercise of stock options				10,763
Issuance of stock awards, net of forfeitures				212,926
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Retirement of treasury shares				(17,257)			(17,257)
Purchase of treasury shares							84,642
Issuance of treasury shares							(67,334)
Non-employee directors' deferred compensation plan							398
Shares end of year at Dec. 31, 2013				35,670,148
Stockholders' Equity Beginning, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2012			$ 0	$ 303,000	$ 387,494,000	$ 315,568,000	$ (184,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to sale of equity				52,000	275,795,000
Purchase of treasury shares							(4,133,000)
Issuance of stock awards, net of forfeitures				2,000
Exercise of stock options					125,000
Share-based Compensation expense	$ 12,880,000				12,402,000
Issuance of treasury shares					(3,270,000)		3,271,000
Retirement of treasury shares					(824,000)		824,000
Tax benefit (detriment) of stock-based compensation					2,489,000
Non-employee directors' deferred compensation plan							(19,000)
Net income (Loss) attributable to shareholders	(22,301,000)					(22,301,000)
Stockholders' Equity Ending, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2013		$ 967,594,000	0	$ 357,000	674,211,000	293,267,000	$ (241,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares, Issued				35,675,656			5,508
Shares issued pursuant to sale of equity				0
Exercise of stock options				0
Issuance of stock awards, net of forfeitures				253,032
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Retirement of treasury shares				(703)			(703)
Purchase of treasury shares							97,646
Issuance of treasury shares							(83,208)
Non-employee directors' deferred compensation plan							2,400
Shares end of year at Dec. 31, 2014				35,906,342
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to sale of equity				$ 0	0
Purchase of treasury shares							$ (5,392,000)
Issuance of stock awards, net of forfeitures				2,000
Exercise of stock options					0
Share-based Compensation expense	17,518,000				17,851,000
Issuance of treasury shares					(4,817,000)		4,817,000
Retirement of treasury shares					(35,000)		35,000
Tax benefit (detriment) of stock-based compensation					1,999,000
Non-employee directors' deferred compensation plan							(130,000)
Net income (Loss) attributable to shareholders	155,435,000					155,435,000
Stockholders' Equity Ending, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2014		1,137,359,000	$ 0	$ 359,000	689,209,000	448,702,000	$ (911,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares, Issued				35,927,985			21,643
Shares issued pursuant to sale of equity				4,002,000
Exercise of stock options				7,720
Issuance of stock awards, net of forfeitures				237,071
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Retirement of treasury shares				0			0
Purchase of treasury shares							120,864
Issuance of treasury shares							(127,159)
Non-employee directors' deferred compensation plan							4,872
Shares end of year at Dec. 31, 2015				40,154,556
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to sale of equity				$ 40,000	202,811,000
Purchase of treasury shares							$ (6,055,000)
Issuance of stock awards, net of forfeitures				3,000
Exercise of stock options					0
Share-based Compensation expense	20,068,000				20,207,000
Issuance of treasury shares					(6,206,000)		6,206,000
Retirement of treasury shares					0		0
Tax benefit (detriment) of stock-based compensation					1,361,000
Non-employee directors' deferred compensation plan							(249,000)
Net income (Loss) attributable to shareholders	$ (68,280,000)					(68,280,000)
Stockholders' Equity Ending, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2015		$ 1,287,197,000		$ 402,000	$ 907,382,000	$ 380,422,000	$ (1,009,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Shares, Issued				40,174,776			20,220