Incentive Award Plan and Employee Stock Purchase Plan (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended		0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 2010 Employee Stock Purchase Plan (ESPP)	Mar. 26, 2014 Chief Executive Officer Performance Based Award	Mar. 26, 2014 Apex employees [Domain] Performance Based Award installment	Jun. 16, 2014 Other Executive Officers [Member] Performance Based Award	May 15, 2014 Other Executive Officers [Member] Performance Based Award	Mar. 26, 2014 Other Executive Officers [Member] Performance Based Award	Jan. 02, 2014 Tranche A [Member] Chief Executive Officer Performance Based Award	Mar. 26, 2014 Tranche B [Member] Chief Executive Officer Performance Based Award installment
Deferred Compensation Arrangement with Individual, Share-based Payments
Share-based awards, grant date fair market value						$ 500,000	$ 2,200,000	$ 35,000	$ 600,000	$ 1,000,000	$ 800,000	$ 3,300,000
Share-based awards, grants in period							60,244	976	16,596	27,141	23,255	91,569
Share-based awards, number of equal vesting components							12					3
Employee stock purchase plan shares issued during period					90,837
Allocated Share-based Compensation Expense	$ 4,100,000	$ 3,500,000	$ 7,300,000	$ 6,000,000