Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Shares sold by certain selling stockholders [Table Text Block]

The Company has completed the following secondary public offerings, whereby certain selling stockholders sold shares of common stock to the underwriters. The Company did not receive any proceeds from these sales of shares.



Secondary Offering Shares	Completion Date of Secondary Offering	Overallotment Shares ⁽¹⁾	Completion Date of Overallotment Shares	Secondary Offering Expenses (in millions)
15,000,000	11/19/2013	2,250,000	12/18/2013	$	0.6
10,000,000	3/12/2014	1,500,000	3/12/2014	$	0.4
15,000,000	5/28/2014	2,250,000	6/4/2014	$	0.5
15,000,000	9/8/2014 ⁽²⁾	—	—	$	0.3
15,000,000	12/8/2014	2,250,000	12/8/2014	$	0.2

(1) Under each underwriting agreement, the selling stockholders granted the underwriters an option, exercisable for thirty days, to purchase up to the additional amount of shares noted.

(2) The option to purchase additional shares was not exercised in connection with the September 2014 secondary offering.

IPO- and secondary-offering related expenses [Table Text Block]

The following pre-tax IPO-related expenses and secondary-offering-related expenses were included within selling and administrative expenses in the consolidated statements of operations for the years ended December 31, 2014 and 2013, respectively.



(in millions)	Year Ended December 31,
	2014		2013
Acceleration charge for certain equity awards and related employer payroll taxes⁽¹⁾	$	—	$	40.7
RDU Plan cash retention pool accrual⁽²⁾	—		7.5
Management services agreement termination fee⁽³⁾	—		24.4
Other expenses ⁽⁴⁾	1.4		2.4
IPO- and secondary-offering-related expenses	$	1.4	$	75.0

(1) See Note 10 for additional discussion of the impact of the IPO on the Company's equity awards.

(2) See Note 12 for additional discussion of this transaction.

(3) Represents the payment of a termination fee to affiliates of the Sponsors in connection with the termination of the management services agreement with such entities.

(4) Other expenses include secondary-offering expenses of $1.4 million and $0.6 million for the years ended December 31, 2014 and 2013, respectively.