Credit Agreements (Details)	6 Months Ended						6 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended		6 Months Ended					6 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 15, 2014 USD ($)	Jun. 30, 2014 USD ($)	May 31, 2013	Mar. 22, 2013	Dec. 31, 2014 JP Morgan [Member] USD ($)	Jun. 30, 2014 JP Morgan [Member] USD ($)	Dec. 31, 2014 JP Morgan UK [Member] USD ($)	Dec. 31, 2014 RBSNederlandNV [Member] EUR (€)	Dec. 31, 2014 Interest Rate Cap [Member] USD ($)	May 31, 2013 Interest Rate Swap [Member] USD ($)	Dec. 31, 2014 Interest Rate Swap [Member] USD ($)	Dec. 31, 2014 Senior Notes due in 2020 [Member] USD ($)	Dec. 31, 2014 2013 Credit Agreement LIBOR [Member]	Dec. 31, 2014 2013 Credit Agreement [Member] USD ($)	Mar. 22, 2013 Swingline Loan [Member] USD ($)	Dec. 31, 2014 Revolving Credit Facility [Member] USD ($)	Mar. 22, 2013 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2014 2013 Credit Agreement One Month LIBOR Margin [Member]	Dec. 31, 2014 2013 Credit Agreement Swingline [Member]	Dec. 31, 2014 Term Loan [Member] USD ($)	Mar. 22, 2013 Term Loan [Member] USD ($)	Dec. 31, 2014 Senior Notes due in 2020 [Member] Senior Notes [Member] USD ($)	Jul. 25, 2013 Senior Notes due in 2020 [Member] Senior Notes [Member]	Dec. 31, 2014 Designated as Hedging Instrument [Member] USD ($)	Jun. 30, 2014 Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2014 Designated as Hedging Instrument [Member] Interest Rate Contract [Member] USD ($)
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																									3.11%
Derivative, Notional Amount	$ 515,541,000			$ 568,853,000																						$ 386,783,000	$ 418,141,000	$ 175,000,000
Deferred Finance Costs, Noncurrent, Net														300,000		2,800,000
Long-term Debt																							200,000,000
Debt Instrument, Face Amount																			200,000,000
Proceeds from Issuance of Long-term Debt		107,500,000
Line of Credit Facility, Current Borrowing Capacity																	75,000,000		300,000,000
Letters of Credit Outstanding, Amount	10,500,000																		10,000,000
Debt Instrument, Basis Spread on Variable Rate															1.75%					0.75%	0.75%
Term Loan, Quarterly Principal Payment Percentage,year one and two						1.25%
Term Loan, Quarterly Principal Payment Percentage,year three						2.50%
Term Loan, Quarterly Principal Payment Percentage,year four						5.00%
Term Loan, Quarterly Principal Payment Percentage,year five						7.50%
Term Loan, Quarterly Principal Payment Percentage,maturity date						37.50%
Credit agreement maximum borrowing capacity									4,500,000	4,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum									2.00%	2.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum									4.00%	4.00%
Line of credit facility amount outstanding																		85,000,000
Long-term Debt, Gross			350,000,000																			185,000,000		100,000,000
Max commitment fee on revolving loan unused amount, percentage	0.35%
Remaining borrowing available under revolving credit facility									4,500,000	4,000,000								215,000,000
Interest rate swap, fixed interest rate	1.30%				0.73%
Derivative interest rate cap arrangement	2.00%
Principal amount of debt hedged with an interest rate swap agreement											25,000,000	100,000,000	75,000,000
Debt, Weighted Average Interest Rate																0.00%
Transfers of Financial Assets Including Debt Activity							71,800,000
Other Short-term Borrowings							$ 0	$ 0